5
Now, I've done some testing and even though I still can't figure out why it is happening, I have added some extra checks and a new update routine for the System Module, where it will look for "orphaned" blocks and templates (i.e. without corresponding modules) and delete them, if any.
Expect a new release over the weekend.
"When you can flatten entire cities at a whim, a tendency towards quiet reflection and seeing-things-from-the-other-fellow's-point-of-view is seldom necessary."
Cusix Software