I had some of the same exact problems as you a few weeks ago with a couple remotes. Sometimes it wouldn't let me move an lcd button to another button, but it would create a blank device in the target button, if I renamed certain devices it would sometimes rename the main WATCH or LISTEN label with whatever I was typing, even though I was only renaming a single device, etc.... a lot of weird/random issues. I had sent tech support the file I was working on but never heard back about.

I finally had to work around all those issues (took me much longer than normal) to get the remote finished and chaulked it up to something in the config file becoming corrupted either during the transfer or while editing.