Serial com issue in application versus source code

[ipc]

I have a test set-up with two serial devices that I communicate using Labview 2011 via a USB hub. I get no errors when I am running the source code. But, when I create an application and run it on a different PC, one of the serial devices freeze up, without generating any error.

Any thoughts on why it could be happening?

Thanks,

[JÞB]

wrong (outdated) Virtual COM Port driver on the target.  or the driver does not support the OS?

[ipc]

Both running on Windows 7. The executable is running on a newer PC. I have reduced my sampling time and put a 1ms delay between write and read. Running it tonight. Let's see what happens.

[JÞB]

If that don't work we can dig into the VCP-  I fought enough battles there!  post which chipset (Prolific, Si Labs, FTDI...) and show us the windows driver setup