Hi Carrie,
We had the same issue about six month ago with Windchill 10.1 M040 and SW2012. Following recommendations of PTC Technical Support, two patches were installed:
10.1-M040_PS16
10.1-M040_WWGM_PS_2
https://www.ptc.com/appserver/cs/view/solution.jsp?n=CS141139
After patches installation on the server, we had to uninstall WGM in each client workstation and install it again.
In our case, the patches installation solved the issue.
I suggest you ask to PTC Technical support for the best solution available today for your Windchill 10.1 release.
Best regards,
Ramon