Switch to light table and it's empty
After editing a photo and returning to the light table, the light table is empty. Clicking on the desired film roll under "recently used film rolls" repopulates the frame.
The behavior has returned to normal (light table is automatically populated with thumbnails) after forcing a new library.db file. Does this suggest library.db was corrupt?
Darktable 0.7.1, using the darktable-unstable PPA for Ubuntu 64-bit.