Find problem with existing VB6 applicatioin

I am a VB programmer. I am putting an app together but I've run into a problem. The problem is that when I try to perform a particular task: If I use a value that the program inserts into a text box, the app fails and errors. If I clear the textbox and add the SAME VALUE manually into the textbox, the program functions perfectly. I have spend hours trying to find out why with no success. Here's what I think I need. Someone to take my app and (after I thoroughly explain the problem through a screen sharing session (SKYPE) on my machine) try it on their machine to see if it still fails. If it does.. fix it if you can. Then, I need you to screen share my machine and make it work here. If you do, I'll pay $50 US If you do not, no payment. $50 is the most I can pay for this help, sorry.