I ran into the following issues after upgrading to Cubase 9/9.5 where iZotope plugins either are blacklisted or not loading - so I did some research and found the following:
–> 64-bit processing precision can increase the CPU load and memory consumption!
Please keep in mind:
Double precision processing is not available for VST2 plug-ins!
Whether a VST3 plug-in or instrument supports 64-bit processing precision is up to the manufacturer of the plug-ins. Some manufacturers advertise an internal (!) 64-bit processing for their plug-ins but still do not support a complete audio processing in 64-bit double precision throughout the whole signal path.
64 bit is not the same as 64 bit floating:
If anyone has a tested and recommended plugin which allows us to run iZotope plugins with no issues please let me know. I’m tired of reinstalling iZotope again and again with it not working properly.