Hi!
I'm having this same issue (thank goodness for google searches to take me to old balsamiq forums!!), but I can't delete the file .bmpr-journal
It says I need administrator's permission, and that I am unable to do anything... Yet it never prompts me as an administrator to do anything.
Brendan, any thoughts here?
If I move the actual balsamiq file (NOT the .bmpr-journal file, but the actual balsamiq project), then I'm able to continue working on my project. But now I have this .bmpr-journal file that is eternally stuck.