my tab crashed and then this same exact thing started happening. The logs mentioned ClipboardServiceEx.
I am rooted, so I started an adb shell and found that /data/clipboard has all the persistent clipboard entries (I love that feature by the way).
I did this:
su
mv /data/clipboard /data/oldclipboard
mkdir /data/clipboard
chmod 775 /data/clipboard
chown system.system /data/clipboard
reboot
This fixed it, although it cleared all my "held" info in the clipboard. A small price to pay. If you really had to, you could probably fish in /data/oldclipboard for it. Of course, now I will go delete oldclipboard.
Hope that helps someone.