https://mining.bitcoin.cz/news/recent-orphaned-blocks-explanation/
I'd be very interested to hear from wizkid057 or Luke-Jr on whether we are also watching our pool; what version of bitcoind Eligius is based off, and whether block submission propagation times are being monitored at all. I'm not just asking because of our terrible luck as of late, which I understand is entirely by chance, but also because having more information on the internal operation of the pool and block submission/fast block relay statistics!
Note that luck is not related to stale blocks (what slush erroneously calls orphaned/invalid).