EPiServer 5 R2 SP1 makes the Page Tree impossible to use. When adding pages in level 2 sometimes the root page is added to the third level and sometimes not.
In level 3 it's impossible (in ff) to add more pages, the context menu is inactive.
Please validate this before you go into production with EPiServer 5 R2 SP1 with clients using Firefox.
Is there anyone else getting these errors?