Logs with debugs info in attach. But there is nothing new, all the same that I gave you more than once, the database you have mine, logs there (and they were a long time). What else to give, so you can not find the cause of the plugin?
The database is not damaged it is perfectly open media portals, SQLite Expert Personal, MePoTools etc. It does not have any errors, and it passes all checks, re-indexing, etc. I you have already said. Can you send it, it's beautiful
The database is not corrupt. Opened by any application. If the database is locked then what? If all of the programs it open? And why not sync folders with thumbnails? And why there is no information in the log file why the plugin does not work?