I have this ongoing problem, doesn't seem to fixing itself, so I try to report it. (I didn't find any duplicate, but you may find it.) An album collection contains 30000+ images, plenty of multilevel subdirectories. It is not filtered, all should be visible. The thumbnails view is active, scrollable. There are parts where the thumbnails do not show up at all. Sometimes when moving the mouse over them they appear and disappear, more often they will not even appear. Moving by keyboard arrows into the void jump to "nowhere", or randomly between the visible and the previous album's thumbnail. The thumbnails may be visible again after restart and other thumbnails would disappear. There seem to be no relevant message on the console. I have several digikam(32006)/digikam (core) Digikam::ThumbnailCreator::createThumbnail: Cannot create thumbnail for "/mnt/big/x/x/2013.12/100_1884.jpg" or digikam(32006)/KEXIV2: Cannot load metadata using Exiv2 (Error # 11 : /mnt/big/x/x/2013.12/100_1884.jpg: The file contains data of an unknown image type kind of messages for unreadable files, but I guess it should not matter for the rest of hundred phoos in the same directory. I do not see any tool for database (sqlite) consistency test or similar. Reproducible: Always Steps to Reproduce: I cannot make a reproduction recipe, it happens at random positions.
Please, 1/ update to last 4.10.0 2/ if problem still here, run kdebugdialog, turn on digiKam debug trace, and run digiKam from a console. Report full trace here. Gilles Caulier
Since Debian doesn't yet have 4.10.0 (I'll open a bug there soon) I used Ubuntu's 4.10.0 package. So far it seems to be of working order: thumbnails all visible. I'll watch what's happening and reopen if the problem appears again. Thank you.