OMG LISTEN TO ME! I FOUND THE WAY AROUND THAT. sorry for the caps lock but here's what you do:
Delete the current sylenth1.dll file and reinstall the 32bit version ONLY and put it in the plugins folder.
Then load up the Vst and it should work!
I have the same problem and I can't figure it out either. However, I've been looking around and as far as I know, no one else has this problem, I mean, I don't see anyone else posting something like this and it doesn't seem to be a common issue so we might have to try and find the problem ourselves.
Omg Thank you so much, I will keep this in case it happens again (probably won't) but thank you so much