I have switched pool - very odd because a few minutes later I checked my Slush account page and it said last share 3 hours ago (was 0 minutes a few minutes earlier when hashing on Slush!)... I don't doubt Slush's honesty or reputation - but can you now trust the actual mining mechanism to be working properly? It is quite possible with the last 2 blocks found stuck on 'processing' that your current mining efforts are being wasted... I shall return when payouts resume or we have an update as to what is happening and some reassurance that current mining is working.