First of all many thanks for keeping this plugin updated! :-)Now the non-modded version crashed on me too. From today on i (tried) adding [%RELEASE_TOTAL_TRACKS% Track'('s')'] to end of master sub-release formatting string (as i liked the ability to see on first view how many tracks a release includes when being in find release window). Fetching of course is slower now, but worked so far. Maybe it's too much information for caching or something like that?
I tried the modded version for the first time today and it's crashing as soon as i'm trying to write the tags to the file. Not sure what i'm doing wrong. Last step could be deleting the discogs_plugin config file, which i'm trying to avoid for now (with non modded version everything worked as expected).
I added the reports. As you can see, i tried different combinations first to no success. Let me know if you need further information. For now back to non modded version... Looking forward the next releases!
EDIT: Out of pure interest i tried it with clean installation and config of your mod, but it's still crashing.