Most of the weird errors users have encountered in the past (not being able to add media directories, the app only starting correctly once, etc) have been caused by issues with reading in or saving the program's configuration files. These files are stored in your home directory. If you are experiencing errors, try deleting the following two files to get up an running again.
This file stores the program's options, your media directories, and the paths to all of the files in the media library.
This file stores the list of recently opened playlists. It was separated out from dirLists.ini so that it could be written frequently without having to write out all the rest of the data that's in that ini file.
Often the problem has nothing to do with listFixHistory.ini, so '''try deleting dirLists.ini first'''.