We have the misfortune to be using CrapCase (Rational ClearCase) at my current workplace and as most people know it is horribly slow. Where this causes a problem is that Resharper always cancels the action it was performing when trying to checkout a file as it must have a very small timeout.
If I open a class file and see a warning I want to resolve (such as removing an unnecessary variable initialisation), then hitting Alt-Enter, Enter starts the checkout as desired, however Resharper does not apply the change.
So then I repeat the Alt-Enter action - however if I do this too quickly then Resharper has not reparsed the file, and instead the top menu item is always a "Suppress warning xxx by #pragma" which obviously was not my intent. So then I have to ctrl+z and try again (or just wait longer for Resharper to catch up).
I get a similar issue with renamings - if it requires file checkouts the whole operation gets cancelled the first time, then I hit shift-F6 again, type me new name again and it succeeds...