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Now, I'm having a similarly 'i didn't do anything!' problem.
When I select 'Files' from the menu and go to browse my music, instead of just the usual music folders and the iPod's 'Notes' and 'Contacts' folders, I now also have a bunch of weirdly named folders and files which either were not there or were hidden before. Files like '._.Trashes', '.DS_Score' and folders like '.Spotlight-V100' and 'iPod_Control' have suddenly appeared.
Or is RockBox just that buggy?
I assume you simply changed the "Show filetypes" option by accident.
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