After having imported my library (2 Tb, nearly 7.000 albums), I stopped MC 17 (Exit). At that point, MC was still building thumbnails - so probably I should have left running MC until all thumbnails had been built, but I (wrongly?) thought MC would continue building the thumbnails at the following start up. But it doesn't...
How can I get MC to build all (i.e. about 6.000...) missing thumbnails?
It is of course unfeasible to build them "one by one", but even when I ask to "rebuild" a missing thumbnail, nothing happens.
Do I have to do the import all over again "from scratch"?