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That would also have been my advise. The DR maintains a sqlite3 database (global.db) that contains all folders and (viewable) files from the SD-card. When the DR boots, the complete SD-card is scanned to see if there are any changes w.r.t. the database (while "Indexing ..." is shown on the screen).
After that the UI only uses the database to show the content of the SD-card.
So if the global.db-file is corrupt, no file can be shown. Unfortunately, the DR does not issue a warning when a corrupt database is found.
A little bit on the side: each folder also contains another database (metadata.db) that contains document specific information that is not needed for the UI, like last-read-page, annotations and bookmarks. These can also get corrupt, resulting in page/annotations/bookmarks not being stored.
Do more people see the corruption of global.db or metadata.db? I wonder if the corruption is related to a manual reset or forced shutdown due to low-battery or if it happens during 'normal' usage.
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