The comments are revision history and aren't really intended to be included with the source. I may consider moving them inside the package body since that avoids this problem. Thanks for the suggestion.
Thanks for the suggestions, but those are not it.
I've explored some more and I think I've determined the cause.
I noticed after my initial post that, when I opened the source file in the Program Window, the tab that usually shows the package name didn't; instead it showed a single question...
I've done this repeatedly as long as I've used PL/SQL Developer but, in the last couple of days, I've noticed that when I thought I was compiling my changes to my source into my test database, it wasn't actually updating the database source. Needless to say, this resulted in much confusion on...