Color Page freezes

Resolve 15 Beta 5: Mac OS High Sierra 13.3
After starting up DR everything is ok... after 2 or 3 times going from edit page to color page and making some grading changes color page freezes... I can use my Mini Panel, see the changes on the Mini Panel display but not in the according Resolve desktop parameters, and the changes I am making are not visible on my grading monitor.
After going back to the Edit Page Resolve jumps correctly to the just made changes in the Color page... then going back to the Color page I do see all the changed parameters.

I have to completely shut down Resolve, start it up again, and then the same behaviour... some changes possible in the Color page, and then Color page freezes again... very very annoying!

I tried everything I could think of but no success... any help highly appreciated if I am doing something wrong or please take it as a major bug report.

Thanks a lot !

[Peter Chamberlain]

Please describe in detail your system

Hi Peter,
thanks for coming back so soon...
My system is more or less simple: Late Mac Pro 2013, 3.5 GHz 6 core, 64 GB RAM, 2x AMD FirePro D500. OS on HighSierra 10.13.3. Ultrastudio 4K Extreme, > 200 TeraByte RAID 5 Thunderbolt storage on different buses, main grading on SONY BVM-X300/2, and a dedicated Genelec 5.1 surround audio system etc.
The problem occurs when I have some 4K DCI ProRes 4444 clips on one timeline... never had that before.
I do handle Sony F65 RAW-SQ files many times without any problem despite the complex and high data rates.

I am very happy with the latest Resolve developments, all is working really perfectly, only the two aspects I have reported do really hurt me. I am an experienced engineer, and believe I know what I do...

Thanks for any help/hint

Best regards
Hans

The D500 might get a bit stressed with 4K DCI.