I've tried to test it here: http://xenforo.com/community/threads/test.71161/ See this gif for more info: http://img837.imageshack.us/img837/4449/q9op.gif It looks like I can reproduce it only once for every page refresh. Meaning, if I try to copy-paste again without refreshing the page, it would work fine. If I refresh the page and do the above, it would happen again. It was tested with Chrome 33, OS X 10.9.2 I've tried to test with FireFox, but couldn't reproduce it, so looks like Chrome specific. Thanks.