I didn't see anything certain with a quick look for obvious problems, but I did find some things to check:
- clean your board
- make sure your uninsulated jumpers aren't connecting to any pads or solder joints they jump over
- press down on the socketed resistors, to make sure they're in tight
I put the cleaning step before the others because the cleaning process can mess the other two steps up. So, if you put it off, re-do the steps you did before.
And of course, get that meter. Until you do, you're just making guesses.
Edited by tangent - 3/21/13 at 12:46pm