Looks like 3 servers are down.  One is the Core 22    https://apps.foldingathome.org/serverstats
 
 

Thanks for the info Scott. My PPD went from 1.6 to bleh. [1.1] lol 
[1] 1080ti 

Looks like it's still down, along with 0x21 (unless that's the same thing). I'm getting a message in the error log reading "CORE_OUTDATED (110 = 0x6e)." The status of the GPU slot is stuck on "Update_Core" and says it's "Waiting On FahCore Update." I tried deleting the work unit's .dat file and removed the GPU folding slot and re-adding it, but it just picked up a new WU that is also stuck. I guess I could keep removing the GPU slot until I get lucky and find a WU that isn't on server 22 or 21. 

I deleted the folder named "cores" in AppData\Roaming\FAHClient. The client didn't recreate the GPU core folder once I restarted the client. The GPU is still stuck on the same WU. I'm not sure what you mean by restarting my network. I've got a router I could reset, but given that it's only affecting the GPU folding slot and not the CPU folding slot, I'll save that as a last resort.