This problem started a few months ago. I'm unable to archive any project after saving. I've tried to trouble shoot by toggling on and off all the options in the archiving panel, renaming all my assets to avoid any special characters, etc. The only thing that works is importing the entire project contents into a new project, saving, then archiving.
This seems to be a common complaint. But I have yet to find the cause or solution. If anyone does, please let me know!