After using Nightly for several months on a new HP Win 8.1 64-bit All-in-One desktop, I've noticed that if I have copied anything from Nightly to the clipboard, it disappears when Nightly is closed, and is not available to be pasted into any application. This includes graphics and text. I just recently realized that Nightly was the culprit when copying from the address bar before closing Nightly, in order to paste the location into Chrome or Firefox - it was gone! A little experimenting verified that it was the act of closing Nightly which cleaned out the clipboard - I just verified by copying this message, and pasting it into a text file, then closing Nightly only to find the clipboard empty when attempting to re-paste the same info into the same text file - gone! I find this uncomfortably reminiscent of past Windows "features" which drove us buggy!  ;)