I restored a backup where no Melda plugins were installed then 8.0.3. It seems be to work normally again, no blank guis or frozen screens.. Maybe a registry issue?
As before I could use acceleration but I disabled it in both versions to conserve, here's what I've noticed so far.
8.0.3: Sonogram doesn't function when accelration is disabled using VST3 but does using VST2.
8.0.2: Sonogram functions using both VST3, VST2 & using accelerated or non modes.
Since I had acceleration disabled in both versions only Sonogram in 8.0.2 would work using VST3, which is what I use.
I'll back up this restore so 8.0.2 never existed, hopefully that solved the problem.