I just updated from DT 1.9a to DT 1.9.1 and most of my documents only showed small icons. When looking at file info I found out that a wrong (old) path was given for the files. When going back to 1.9a links are still corrupt. I used this old path some time ago but then reorganized the folder structure of the original files.
However I’m quite sure that I completely reimported all documents after this restructuring. On the other hand this does no sound logical to me because where should DT get this old path from?