cgminer always discards work

i have tried a few different pools but cgminer always discards work:

Pool: stratum+tcp:// Work templates received: 31 Share submissions: 0 Accepted shares: 0 Rejected shares: 0 Accepted difficulty shares: 0 Rejected difficulty shares: 0 Items worked on: 2 Discarded work due to new blocks: 480 Stale submissions discarded due to new blocks: 0 Unable to get work from server occasions: 0 Submitting work remotely delay occasions: 0 

is this a bug, misconfiguration, or unsupported platform?

(ubuntu on commodity linux pc, yes i know mining on cpu is severely outdated but i am just for fun not for profit;)