Hashcat crashing

[rln11]

Trying to output some cracked hashes from my POT file but hashcat just keeps crashing. At first I thought it might have been the size of my file. It contains 520k Joomla hashes. But I cut out a small sample size just to see if it was an issue and the same thing happens. Windows just reports that hashcat has stopped working and the program stops without displaying any error message. I tired with both the 32 and 64 bit exe's. Is it possible my POT file is corrupted? Is there any way to check for this? Any advice on how to proceed with this issue would be greatly appreciated.

This is what my command line looks like. I'm running hashcat in a 64bit Win 7 cmd window:

cudahashcat-plus64 -m 11 --username --remove c:\downloads\test.txt >> c:\downloads\testOUT.txt

GTX560 with the latest drivers (327.23 released on 9/19)