I dragged a folder with my entire music collection in it to the playlist editor, it took a few hours to load, then I sent it to a playlist, primarily to get a report of the number of items & duration as I am editing the collecting and wanted to see the progress since the last edit.
Somewhere along the line I closed and re-started Wacup with the playlist still loaded...
a) Wacup would not re-start, I did not see it in the task manager and I did not scroll down to the background tasks to see that multiple instances of Wacup was actually running.
b) I searched the forum and started performing troubleshooting tips on the "Wackup Won't Start" Thread.
c) I attempted to re-install but received error messages because the files that needed to be written were open or in use.
d) I finally performed a clean install and lost ALL my customization, playlists & some internet radio stations that were bookmarked.
e) After Wacup was re-installed I did it again (dragged my entire music collection in it to the playlist editor), after it loaded I closed Wacup, then re-started Wacup and walked away, 3 hours later I checked and Wacup was up and running so I assume the large playlist caused the problem.
The playlist I created was impractical and maybe their is a better way to do what I did but I'm posting this comedy of errors as I have found that if I did this eventually someone else will do it. Not sure how easy it would be to put a "stupid" error message for this type of action, Wacup would have to have some way to evaluate the folder attributes and show a warning message.
Anyway Dont Do This!