I get an "internal error" copying to clipboard (Reader 10.1.1, Windows 7 64-bit) when TightVncviewer (V2.0.4) is running simultaneously.
I assume TightVncviewer monitors the clipboard to copy the actual content to the remote machine.
Closing TightVncviewer resolves the issue. However, I need to use that tool frequently so that's an annoying bug.
As a workaround, I downgraded to Reader 9.
Retrieving data ...