The subject states the problem. I have great video cards well over 1gb of VRAM, but on both my Windows desktop and my Mac desktop scrubby zoom will work fine for a bit and then cut out. I then have to use the regular zoom function for the rest of the session. The main annoying thing is that I will keep trying to use scrubby zoom unconsciously and I find myself zoomed in at like 6200%, then I have zoom back out which is really inconvenient. I have looked and never found anything about this on the forums, but I know with two computers of my own doing it that surely somebody else gets this!
Closing and reopening the app fixes the problem and it seems to happen when I have a lot of vectors on screen and I'm zooming in or out very often.
Thanks for reading.