Hi Sam,
We can try to narrow down the root cause with the following methods.
1.
Try disable all the add-ins to see if this behavior could be caused by the 3rd-party add-ins, if this behavior won't occur with all the add-ins disabled, we can enable them one by one to find out which one might caused the problem.
2.
Try repair Office as a quick fix
3.
Try start Word in
safe mode to see if this behavior will still occur, if this behaivor won't occur in safe mode, the behavior might be caused by certain items that are loaded with Word, try follow the instructions in the following support article:
http://support.microsoft.com/kb/921541
4.
Try configure Windows in
clean boot mode to check if this behavior could be caused by the 3rd-party services, if this behavior won't occur in clean boot mode, try follow the instructions in the
How to determine what is causing the problem by performing a clean boot section in the following support article:
http://support.microsoft.com/kb/929135
Additionally, we can also use the Process Monitor to capture more details:
http://technet.microsoft.com/en-US/sysinternals/bb896645.aspx
Max Meng
TechNet Community Support
