I had to reinstall Logos 4 beta 8 over the weekend because of a problem that prevented Logos from opening. I did a straight reload, download and index. All my collections were lost. Not cool as that invalidates my Passage Guides as well.
All my collections were lost
Both you and me!
You can recover if you have another installation, though.
So I discovered but thanks for letting me know. It took at bit of time for it to soak through to me that I could recover.