Does this happen with a particular web site or with any web site? If the latter, try troubleshooting for poorly designed add-ins, which may interfere with copy and paste operations in Word. See the sections that refer to manual troubleshooting of COM and
Startup add-ins in the article at
https://support.microsoft.com/kb/921541/en-us (How to troubleshoot problems that occur when you start or use Word).
Stefan Blom, Microsoft Word MVP
