Yes lots of them, please use the search box above, and the letters UAD and you will immediately stumble into a lot of threads. There are some issues UAD will need to fix, and there will be some workarounds introduced with X3E to relieve some issues (but won't fix them as the issues mainly lie with Universal Audio). Anyway please don't trust what I or anybody says specifically, there are plenty of statements from Cakewalk in those threads to take heed of (please especially avoid peoples rewrites or "artistic" reinterpretations or re-rendering of what was actually said by Cake).
At the end of the day it seems that is a light at the end of the tunnel but it's a matter of UAD getting fixes out + Sonar X3E patch coming out which is taxing the patience of UAD users. Also people are able to roll back their software as a workaround. Sadly it really isn't Cakewalks fault but of course they are being held to account anyway.
I'm not sure specifically though about the situation with X1 though, I'm looking at it from the X3 angle (and you are not stating any specific hardware). So here is a general response to a general question, anyway please ignore what I said and have a good thread read.
Thanks...