Sorry, I should have given more detail... I'm on Resolve 15b3, Windows 10 Pro, 32GB RAM, i7 6800K, GTX1080, DeckLink Mini Monitor 4K.
To recreate this issue just add a TimeSpeed to the flow in the Fusion page and try to drag the Speed value to '0'. Workaround was to double click and enter '0', I found that works.
Logs are here Download link
https://wetransfer.com/downloads/18df37 ... 835/13b762 Many thanks for your response. So good to have Fusion here!