While browsing the web the other day and I was in the midst of entering a search term when an odd little window unexpectedly popped up. 
It was titled “Ruler”, and offered some options to check, such as “Snap to X/Y axis” and “Hide Tick marks.”
I found that my keyboard was no longer responding, so I clicked the peculiar popup’s close box and continued typing. All was fine until I had occasion to enter an upper case “R,” then suddenly the strange ruler window popped up again. What the hack was going on?
The ruler box is a feature of the Internet Explorer 7 Developer Toolbar add-on and for some reason is in certain versions of the toolbar and not others for various versions of IE. Go figure? 
To make the Shift-R ruler “feature” go away, I typed Ctrl-Shift-J and the Shift-R now works as it should. You may need to bring up the Developer Tool Bar before hitting the keys strokes to make the change take effect, by selecting View | Explorer Bar
