Shortly after logging in to WoW, I get this message just after GRM finishes a sync:

GRM WARNING!!! FAILURE TO LOAD THIS KEY:
PLEASE REPORT TO ADDON DEV! THANK YOU!

That's the whole message - nothing about which or what key, specifically, and BugSack didn't catch an error.

I am going to set this to Lua error if passed an empty string next update so I can at least get a trace on the source. Thanks for the report - I will push this in the next update. Closing this for now.

Actually - would you be able to tell me if this happened on another language client than English you might have been using?

I only use the English client. But this error does seem to appear on every sync attempt.

Ok I'll keep this open for now but let me know if you see it in the latest GRM build - and if sync is completing properly TY

Ok great. Thanks! I'll close for now then. If it resurfaces let me know!

I've gotten through a couple of syncs with my guildies now without seeing this message again.