Fr. Devin suggested I open a thread and report this bug, it has been around for years and I have seen others report it.
This time, I video'd it. It manifests in several ways, but the easiest to duplicate is to:
1. Open a Personal Book - build it. It builds successfully.
2. Close the book, but leave the Personal Book open (or close and reopen - it does not matter).
3. Build the same resource again - it fails, "Could not remove existing resource. Please close all open panels and try again".
Except there are no open panels. Even if I close and reopen the Personal Book panel (which I did not do in the video), it still errors out the same way.
I did this twice in the video, two different books. This is a link to my Dropbox to download the video in MP4 format, as it is about 90 seconds long but 45MB in size. If I should send the video somewhere else, please let me know.
I hope this can be fixed!
https://www.dropbox.com/s/97x8su6v3ed5hgt/PB%20Cant%20Recompile.mp4?dl=0