Storyboard Pro 7 keeps freezing

Hi, I just installed Storyboard Pro 7 for a new job and I have an issue. The moment I switch to the brush tool or when I do pretty much anything, the program freezes, the screen goes white and nothing happens even if I wait minutes, until I shut it down. It happened to me multiple time yesterday, then at some point it started working and I was able to do my work that day, but now the same thing is happening this morning and I’d like to know what’s causing it. My PC is about 5 years old but it had no issue running Storyboard 6.

My processor is Intel(R) Xeon(R) CPU E5 - 1650 v3 @ 3.50 GHz

My graphics card is an NVIDIA Quadro K4200.

similar problems / my system is very powerful …just updated to windows 10 and my version 6 would crash every time I touched an audio track. So I updated to version 7. The crashes are much less frequent now…but still weird and glitchy : my stylus will not interact with my toolbars from 5 pm to 6:30 pm for example.