I renamed all the Gilmour rigs I bought from TAF so that they start with "!" and made no other changes to those rigs. After I updated to 2.2, I found that they were all gone. I'm not talking about MIDI assignments, the rigs simply vanished from Browse mode. Oddly, I have other rigs that I customized that also begin with "!", and they survived the update. I didn't notice any non-"!" rigs missing. It's not a big deal in my case because I was easily able to restore the missing rigs, but I thought it was odd.
As always, be sure to back up your rigs before you update firmware!