Commented Unassigned: Conversion hangs - intermittent [1854]

I installed the latest MCEB beta on a new PC a week or two ago. Worked pretty well for a while, but the last couple of days, some files are getting stuck in the conversion process. Rebooting did not fix the problem. One of these files converted successfully on a second attempt, while another failed twice but succeeded on the third try. Here's a couple of logs:

http://1drv.ms/1g2sBtZ

http://1drv.ms/1g2xlzU
Comments: ** Comment from web user: rboy1 **

If I understand your log correctly you're using Windows 8.0 and the latest intel driver for windows 8.0 is 9.17.x

Any particular reason you aren't updating to 8.1 ?