[DrChiper]

Originally Posted by kacir

I ended up installing something like this:
http://www.nirsoft.net/utils/opened_files_view.html
that enabled me to dump and analyze every single access to a file or a directory - to see what the program was trying to access.

I'm using the free Microsoft app "procmon" (process monitor), which can be obtained from sysinternals
https://technet.microsoft.com/en-us/sysinternals

It provides all kinds of overviews on registry, files, networks, processes and profiling. Highly recommended. They have other nifty tools too.

Of course, today I couldn't find any freeze at all

Most time seems to be spend in pylib.zip, and there are quite a number of buffer overflows in the plugins and calibre resources. As there is no freeze, however, that does not seems to be too harmful