• Addon version name: Bagnon 10.2.31
• Client used: Classic Wow 1.15.3 SoD

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Talking to any NPC with a vendor window prevents the window (and my bags) from opening. Gives error in the chat "Interface action failed because of an Addon. Tried the console scripterror thing and nothing popped up. I tried reinstalling the addon, deleting all saved settings, completely deleting everything and reinstalling, continued to get the issue.

As soon as I log out and log back in, it will work fine again until it gets "triggered." Seems to happen when I'm going back and forth between Vendor NPC's or trainers. Reloading the UI does not fix it, only relogging into the game. Don't have a screenshot as there's nothing to really show except that error line in chat "Interface action failed because of an AddOn" which seems to only show the first time after the UI is reloaded.

I've got same problem, but alliance only, and in Stormwind only. Doesn't reset or re-log or re-install.
I've heard that undying mob that is kited sometimes to the Stormwind has to do something with it, like making vendors go constant combat state. Haven't seen the mob, tho. Might be gossip.