I was actually reluctant to install the upgrade after I read your post and didn’t know it was available until then, however it seems to be fine here.
There have been times when Blocs was really unreliable for me, though this was mainly the case under Blocs 2. I have to say I am not seeing any of the recent issues that some are reporting. At one time I remember nothing was working properly with Blocs, such as custom classes not being set properly and everything improved after reinstalling the OS.