So I had a miner and a pump set up to do some digging, normally this isn't a problem. However I ran into this weird little "issue" when the miner hit running water at level 20 or something, the water was coming all the way from level 64. The miner just stopped and did nothing. The pump didn't work(no idea if it even sucks water, but still, no source block anywhere near it). Anyways to make a long story short I had to dig down and cut off water stream to get the miner working again. I read that the miner is suppose to ignore water and go straight down, my miner did not.
MC 1.2.5 using 1.103. My rig can't play 1.3.2 yet /sigh. Hoping for 1.4 and that "performance" patch, if that even does anything.