I've tried to install Resharper ultimate for VS'2013 Ultimate and VS'15 Community. And in both cases I've found an issue with loading of environment setting.
Particularly I open Find and replace dialog, set there file types and folder for search in, search. All is fine while. But then I restart VisualStudio.
In normal case my settings for search must be saved and loaded after restarting VS (Find and replace dialog saves last search settings always). But when resharper is installed it doesn't! After restart I have clean Find and replace dialog and must set folder and file types again.
If I uninstall Resharper - all works fine even after restarting VS!
Is it bug in Resharper Ultimate? Because I've tried VS'13 Ultimate with Resharper 8 - and all worked fine! There weren't such problems!