Testing some functions of a driver manually this morning, and I thought I had a bug in something that was working just fine last night. It turned out to be PEBKAC. The only solution to that I have found is to automate, automate, automate... Of course, in the short term, it is quicker to test some things manually, but in the long term, you get PEBKAC and worse. Must find time to automate some simple tests.