I had this same issue happen to me, but only once, and only on one instance of UltraReverb among many that were being used in the project. It was very strange. If I remember correctly, the settings would be saved, but the Dry/Wet slider would revert to default (100% wet) only after hitting the loop point. So, I would be listening to the last few seconds of a track that I composed to loop seamlessly, and I'd have to keep readjusting the dry/wet setting every time it looped back to the beginning of the track. Again, only on the one instance of UltraReverb (it was on an acoustic guitar). Very annoying. I think what I ended up doing is taking a screenshot of the settings I had it on, deleting that instance, reloading a new one, and just redoing the settings I had it on.