I went to run 7.66 today and was surprised to see the splash screen popup (with the Continue button). I thought maybe mIRC had updated itself and this is what happens after an update, but then it popped up the Options dialog and everything was gone. My preferred nick, email, name, etc. All my saved servers and customizations. And what's really curious, the list of Favorite channels has none of the default channels that come with mIRC (and which I never deleted).

I didn't do anything weird after the last time I ran mIRC successfully. Running latest win 10, just standard Defender AV. I do use windows Controlled Folders but there was nothing in the block history.