Sigh... Left my machines mining through the night again, zero blocks. 7.4hpm (split into 4 threads of 1.85 hpm) plus 10.8 hpm (4 times 2.7 hpm).
Mysteriously, my 7.4hpm machine has been mining for nearly 40 hours straight and never found a block. In reality, it should have found 3 to 4 blocks. Does splitting into more processes reduce the effectiveness of mining? (It shouldn't, but I'm going to ask just in case). Or am I just extremely (<2% chance) unlucky?
Same here, runing 2x 8,5 hpm (17hpm total) and only found one block....what internet speed do you have?What ping do you have to US or EU ?
I am wondering if that might be the problem (as I have a high ping to US and EU )

If you want to check how many orphan blocks you may have found, go to Help -> Debug Window -> Information -> Open (debug log)
Look for "generated block is stale".
Each one is where you found a block, but someone beat you to it.