Many posters are heaving difficulty with losing shelves.
One one of the two occasions I lost my shelves (prior to 2.05), it occurred when I used Open Explorer to delect a.doc file I had converted (on the HD) from a .pdf file (using the Office app). I was not hooked up to the computer at the time. Simultaneously, the HD accessed my SD card, even though the file was stored on internal memory.At the time, I thought there might be an issue with either Open Explorer or the Office app, as I was able to recreate it 3 times.
On the other occasion, I was hooked up to the computer like both Compulsive and Juniona, and deleted a corrupted book I had just sideloaded through Calibre; on that occasion, I thought the issue might have been my fault because I may have deleted before I actually closed out the ebook. Again, although all my sideloaded books were on internal memory, the HD tried to access the SD card right before the shelves disappeared.
5ivedom also lost shelves when deleting a scrapbook while connected from the computer. I know Juniona's books were on her SD card; were yours Compulsive?
Others have reported losing shelves when adding a child profile.
It almost seems as if the HD gets mixed up regarding which drive to access in these situations.
Some have also reported losing shelves when turning the HD off and restarting; I'd be curious to know what occurred right before the shutdown and restart. For those reporters, at least one did not have an SD card installed.