I'm in the midst of a massive (attempted) upload to Ancestry. As I'm doing this I'll find issues and try to fix them using the various RM tools. One thing I can cause to happen consistently is doing several TreeShare actions (i.e. both new upload and sync) and then attempting to run the Merge -> Duplicate Scan. Every time I do that I get an index error, and the only possible way to continue is to quit RM and restart. I have submitted the error reports each time this has happened.
Index error when running dup check after using TreeShare
Posted 11 August 2017 - 09:45 PM
There is clearly a bug that needs to be fixed, but you might be able to avoid the error by doing the TreeShare actions, and then running File->Database Tools before running Merge->Duplicate Scan. I don't know for sure that it will work, but it stands a reasonable chance and it can't hurt.