Advanced Combine Rows running very long and leaving blank cells

Question

I am having a problem with Advance Combine rows. I have a large sheet (few thousand rows). I am trying to do an advance row combine. The process runs for a very, very long time (about 30 - 45 mins) and then leaves my sheet completely blank. I thought it might be a bug, so I installed KuTools on another machine and ran the same operation. Works fine. To troubleshoot, I:

Uninstalled KuTools and reinstalled. Problem persists.
Uninstalled KuTools. Uninstalled Office. Reinstalled Office. Reinstalled Kutools. Problem persists.
Uninstalled KuTools. Removed every instance of KuTools and KTE in the registry. Reinstalled KuTools via MSI. Problem persists.

Not sure what else to do... help?