We're able to reproduce this with Omnipressor in 64-bit Cubase 6.5. We should be looking into a fix for it shortly. Thanks for the heads up.
We can't reproduce this with 2016 or Blackhole, and all plugins seem to be working in 32-bit Cubase 6.5. For those of you that do have issues with these can you please post steps for what you're doing so that we can reproduce the issues on our end (and subsequently look into fixing these issues)?