Mocha Pro 8.01 OFX - "Unknown Error"

Is someone here having an "unknown error" from Mocha Pro 8.01 (OFX) with Resolve 17b6?
I didn't have the problem with the beta 5, and there was not change in my graphics card drivers or anything since.
I uninstalled mocha, and installed it again, same thing. And the window of mocha is very slow.
I'm asking here because it worked well on all the previous beta of Resolve v17. So it doesn't look like it's a problem from the plugin itself (or is it?).
It still works with Fusion 17 beta 5 (so I won't install the beta 6).
Another question, is it a problem going back to Resolve Beta 5 from the beta 6?
Thanks
PS.
On I have tons of : UI | WARN | entries in the "ResolveDebug.txt" and for UI.MenuBar too
---
The logs form Mocha Pro
Dec 22 23:37:50 (mochaPro_plugin) Commenced logging at Tue Dec 22 23:37:50 2020
Dec 22 23:37:50 (mochaPro_plugin) Plugin host id: 'com.blackmagicdesign.Fusion'
Dec 22 23:37:50 (mochaPro_plugin) Plugin host type: BlackMagic
Dec 22 23:37:50 (mochaPro_plugin) Build Date Dec 5 2020
Dec 22 23:37:50 (mochaPro_plugin) Version 8.0.1 build 101.g903c26329626 win_x86_64.
Dec 22 23:37:50 (mochaPro_plugin) Windows 10 64-bit
Dec 22 23:37:50 (mochaPro_plugin) TaskManager initialised (11)
Dec 22 23:37:50 (mochaPro_plugin) [RepriseLicenseManager]: initialised with licence dir C:/ProgramData/GenArts/rlm
Dec 22 23:37:50 (mochaPro_plugin) Locale: default
Dec 22 23:40:10 (mochaui) ===> Unknown error
Dec 22 23:40:10 (mochaui) File::0:
Dec 22 23:40:10 (mochaui) Context: Unknown error
Dec 22 23:40:10 (mochaui) Message: Unknown error
Dec 22 23:40:14 (mochaui) ===> Unknown error
Dec 22 23:40:14 (mochaui) File::0:
Dec 22 23:40:14 (mochaui) Context: Unknown error
Part of the log from Davinci Resolve 17 b6 after launching Mocha Pro from the Fusion page (simple clip cut on the timeline)
[0x000039ec] | Fusion | INFO | 2020-12-22 23:33:33,921 | Started FusionAudio Worker thread
[0x00003f1c] | UI | WARN | 2020-12-22 23:33:34,208 | UI Persistence - MediaPoolFloatingWindowGeometry not read
[0x00003f1c] | SyManager.Signals | INFO | 2020-12-22 23:33:34,245 | Main view page is changed to 16
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large
It repeats until I close the Mocha Pro window
---
Windows 10 64 (latest version)
Radeon RX Vega 56 (latest drivers)
AMD 3900x
I didn't have the problem with the beta 5, and there was not change in my graphics card drivers or anything since.
I uninstalled mocha, and installed it again, same thing. And the window of mocha is very slow.
I'm asking here because it worked well on all the previous beta of Resolve v17. So it doesn't look like it's a problem from the plugin itself (or is it?).
It still works with Fusion 17 beta 5 (so I won't install the beta 6).
Another question, is it a problem going back to Resolve Beta 5 from the beta 6?
Thanks
PS.
On I have tons of : UI | WARN | entries in the "ResolveDebug.txt" and for UI.MenuBar too
---
The logs form Mocha Pro
Dec 22 23:37:50 (mochaPro_plugin) Commenced logging at Tue Dec 22 23:37:50 2020
Dec 22 23:37:50 (mochaPro_plugin) Plugin host id: 'com.blackmagicdesign.Fusion'
Dec 22 23:37:50 (mochaPro_plugin) Plugin host type: BlackMagic
Dec 22 23:37:50 (mochaPro_plugin) Build Date Dec 5 2020
Dec 22 23:37:50 (mochaPro_plugin) Version 8.0.1 build 101.g903c26329626 win_x86_64.
Dec 22 23:37:50 (mochaPro_plugin) Windows 10 64-bit
Dec 22 23:37:50 (mochaPro_plugin) TaskManager initialised (11)
Dec 22 23:37:50 (mochaPro_plugin) [RepriseLicenseManager]: initialised with licence dir C:/ProgramData/GenArts/rlm
Dec 22 23:37:50 (mochaPro_plugin) Locale: default
Dec 22 23:40:10 (mochaui) ===> Unknown error
Dec 22 23:40:10 (mochaui) File::0:
Dec 22 23:40:10 (mochaui) Context: Unknown error
Dec 22 23:40:10 (mochaui) Message: Unknown error
Dec 22 23:40:14 (mochaui) ===> Unknown error
Dec 22 23:40:14 (mochaui) File::0:
Dec 22 23:40:14 (mochaui) Context: Unknown error
Part of the log from Davinci Resolve 17 b6 after launching Mocha Pro from the Fusion page (simple clip cut on the timeline)
[0x000039ec] | Fusion | INFO | 2020-12-22 23:33:33,921 | Started FusionAudio Worker thread
[0x00003f1c] | UI | WARN | 2020-12-22 23:33:34,208 | UI Persistence - MediaPoolFloatingWindowGeometry not read
[0x00003f1c] | SyManager.Signals | INFO | 2020-12-22 23:33:34,245 | Main view page is changed to 16
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large (10506240 > 1048576)'
ClientNode: failed to respond to message '--request-frame=9605': exception 'Message too large
It repeats until I close the Mocha Pro window
---
Windows 10 64 (latest version)
Radeon RX Vega 56 (latest drivers)
AMD 3900x