I've had problems with getting 3rd party VST plug-ins to work for years on PowerTracks and RealBand. They would work great for a day or so and then somehow get corrupted and, though they would run, the output was very weird.

Today I figured out a work-around. It seems to work fine if you only have 1 plug-in added (there is room for 4). If you have more than one, just mute the ones you aren't using and the one you've selected will work.

Plug-ins are very important to me and I'm happy I can now use them on RealBand. In the past I've had to export a track, run the plug-in Audacity, and then import it back to RealBand.