I have a MySite host personalized with a custom master page and a usercontrol with a listview on it.
I'm getting a "This Page has been modified since you opened it" error message when trying to create a personal site for a user. The logs show a ViewStateException.
By removing the usercontrol it works well.
I've also disabled the ViewState (EnableViewState="false") at the page and control level but I didn't have any success.
Any ideas on how to solve this issue?
The problem was that the personal site collection had a custom master page defined that had Controls with active viewstate.
The solution was to change that master page to the default, since I didn't need a custom master page on the personal site, only on the root site.