Since Hoster 3.303 works fine I can't see how reformatting would help.
Also I would lose all the work I have done. I use this laptop for live performances as well.
Anyway, in the end 3.303 work fine, so if there is a problem it isn't directly Hoster related, but due to the new database.
Hoster 3.310 starts, and looks like it would work, except I can't read or build a database. Hardly a disk format problem
Dave Everett