Ugh, there are few things I hate more as a software user than when the software spams me with a giant box after an update telling me what's changed. I already read the changelog before I updated, and if I was too lazy to do that, then I don't care, and I'll notice the changes if/when they affect me later. :(
It only comes up one time. And I don't want to get a million questions from people saying why is this not working. Well did you read the help file. Version 200 is a major change, nearly every line of code changes in some way. Normally I don't bother.
Not one time per profile either. I save the flag separate from the profile.