Looking for C#, C++ Programmer For A Quick Program Fix. Willing To Pay ~$500

Long story short:

I hired a developer to develop a client software to connect to a windows pc for my iPhone / iPad app. That developer developed the client software, and it works on my pc, but no one elses. Everyone gets the same error message.

The developer I paid $2400 to basically just sent me an email saying "oh well I cant fix it tough" and split with the cash.

So I am looking for a programmer to fix this bug, the app works on my pc so I figure it cant be too big a hurdle, and $500 is good money even if it takes 10 hours.

Anyone interested?

I have all the source code available in a zip file to send out, would appreciate someone to take a look at it and just let me know your price to fix it. I don't trust elance anymore. I posted this to elance and every provider I have met with has given me wildly different answers and budgets.

Please send me a PM if interested so we can work it out. I am more than willing to set up a milestone system or work through escrow, I also have verified paypal ready to go, I just need to get this out ASAP.

Heres the error dialog BTW
http://i53.tinypic.com/bimm8z.jpg

its for this app:
http://sc2gameboard.com/