No, there won't be any stratum problem using cgminer with Raspberry PI.
So, we now have software that doesn't have the stratum problem. Meanwhile, the 2.4PH/s btcguild userid 566620 has disappeared in the past 48 hours, causing btcguild pool hash rate to
dip significantly. And the
1H7FpBV8huVmPvt5eRzszAkgnERH2FaWvq address which luffy27 and others speculate to belong to AM has likewise stopped receiving payouts.
Disclaimer: correlation != causation.
This might have to do with my ealier prediction that AM's hashrate will soon be large enough to start self-mining again. They might be quitting BTCGuild in order to prepare for self-mining.
Disclaimer: Very speculative.