I'm using ValhallaDSP's ValhallaRoom. How to reproduce this bug:
1. add ValhallaRoom to the plug-in chain
2. change some parameters in the VST (mix, predelay...)
3. close the VST window
4. open the VST window
When it's reopened the parameters are back to the default. And you can hear it, it's not just visual.
Sound Forge 13.0 build 76, 64 bit.