Just tried 32 bit VST... working here too.
All Night, my issue wasn't that VST 32-bit wasn't working. It was just a strange behavior that popped up a blank screen that you can't close when closing the ST window. The VST plugin works great. Just strange behavior.
Found the cause! It was a code change on my end, which probably got triggered by a bridge plugin to run a 32 bit VST in a 64 bit environment. After closing the GUI, the 32 bit VST in a 64 bit host got an extra call changing the window size to something very small. That triggered the GUI code to become active - most of that is skipped if the window is invisible. But unfortunately, not the part where I hide, resize, and then again display the window. So, even though it should have been hidden it was displayed - and the rest of the code assumed that it was hidden and didn't do anything with it.
It may also behave like this in other hosts. I guess that there is a standard 64-to-32 bridge that multiple people use.