Finally, my pair of Mackie UAD-1’s in Cubase 7 (use to work fine in 6.5). I’ve had a continual problem with my UAD-1 plugins being randomly deactivated or having the ability to ONLY use ONE plugin at a time. 7.0.6 has came at a perfect time since I just started mixing down a year long album project and I can finally use the lush UAD plugins without issues. I wish I had them working reliably during the entire project though.
There were known issues with the UAD plug-in platform and earlier versions of Cubase 7 and in some cases 6.5. They have attempted to address these issues in the most recent update 7.0.6 as you have seemingly discovered.