The only serious problem with Demetra testing was the project file "corruption". Now with 5.1.1 EAP we passed it. But another thing happened. Sometimes some buttons (I do not know why) become disabled. For example, buttons in the window with Demetra's exceptions stacktrace.
May be it's not a bug? :)
And, most annoying thing in last build was, that sometimes I was unable to "go to file". I press "CtrlShiftN", then enter several symbols... and nothing happens. There is a stacktrace but as I said buttons were disabled, so I can't send it to you.