I remember some issues with the filter frequency range when modulated with the envelopes (I think that one is fixed now), some issues with the preset manager I can't remember precisely now, an issue with drag & drop modulation (also fixed now), the broken MIDI learn system with the VST3 version (still not fixed), and some other issue I can't remember now.
The main issue I saw with the updates is that they didn't seem to be tested properly. I'm sure they do some "in house" beta testing, but, that's just not enough.