Hiya,
Before I tell you what's not working I thought I should say that your product is very good and I'm enjoying using it. Also that I'm running Windows 8.1 64Bit with 8GB RAM.
I had 171 DNG files that I needed to export/convert into JPG, saving on the Desktop. I used a batch job to do it. It crashed my computer so completely I had to resort to the power off button to reboot it; even my mouse wouldn't work. I thought, mmm OK, 171 DNG files – maybe I'm being a bit ambitious! So I tried 15 DNG files. Same result. I then opened Lightroom and it exported 171 DNG files to JPG in ten minutes and I could carry on working while it did it.
Any ideas? (Please don't say that batch job is only designed to do one file at a time. )
Paul