I have had the copy paste issue on Poloniex. These seemed to fix it, might on BTS too:
1 - Don't do a CTRL+C/CTRL+V. Do an actual highlight, right click, then copy and usually it will paste on the other too.
2 - Try another browser.
3 - Restart. Sometimes both above did not seem to work but I restarted and it worked.
Hmm. Thanks for the tips. I am using highlight and right click to copy. I have the light exchange installed for BTS. Maybe I need to download the software. ???? I'll try using another browser. :)