Open File Structure View, set it as a Tabbed Document (as the sidebar docker bugs too often, I keep it this way ? yep, bugs also, but easier to fix; also, it's turned out to be a convenient way). When switching to file structure from a normal document, either by hotkey or simple Ctrl+Tab switch, the window rapidly gets and loses focus several times (4+), which causes the selection bar and other labels to flicker with [focused-blue -> nonfocused-grey -> focused-blue -> nonfocused-grey and so on] background color. A page fault + swapping may occur in between some of the flickers (=> R# loads smth). The same thing happens when just switching to another app and then back to DEVENV where File Structure is opened as the current document: setfocus, killfocus, setfocus, in this case two times only.