Same problem here. I updated to 2.3 on the 16th I believe. I just happened to check for new updates on my Evo Shift and discovered that it had just been released. I get that "loading" thing all the time now, and it's really annoying.
The biggest reason I found my way here tonight though, is that I've had major problems ever since updating to 2.3 (Gingerbread) on my Evo Shift. Basically, NONE of my apps that are supposed to routinely check for updates are updating, even if I tell them to manually check. Friend Stream hasn't worked at ALL since the Android 2.3 update, it's completely blank and says there are "no recent updates". The Facebook app, which has always been very sporatic getting updates as long as I've had the phone, also has not received any updates since I installed Android 2.3 (Ginberbread). My calendar also will not sync with the GMAIL calendar since the 2.3 update, and I just noticed that the email accounts I have set up on my phone (2 AOL accounts) are not syncing either.
In short, NOTHING is updating manually or automatically as best I can tell. My internet is working fine, both 3G and WiFi (I don't have 4G where I live) and I can update or download new apps fine, but if there's a particular function on the phone that's used by all of the programs I mentioned to update themselves, then this function is NOT working since the 2.3 update (for me at least).
I've only been using an Android phone for a couple months, so I don't know the inner workings, but if there are any Android experts out there that have any suggestions, please chime in. Also, if anybody else is having similar problems since the Gingberbread update for the Evo Shift a few days ago, I'd really like to know.
TIA!