We have some portable carts that we use with FTR Gold 5.6.1 and DMX4 USB mixers. We just replaced a couple of older laptops with new Dell Latitude E5430s. I follow the same proceedure that I have done many times installing the mixer drivers and then FTR Gold. I also installed the FTRGold5.x registry file. These machines have Windows 7 Enterprise 64-bit just like several others we have at the court with no problems.
So, I plug in the cart which powers up the mixer and the laptop power supply. I turn the laptop on and login to Windows. Open FTR and start recording and I get the 'specified audio capture device could not be found' message. The DMX4 Config program also shows no sound. I restart the computer and everything is working fine again. However, the next time I unplug the cart I will have the same problem.
I have also noticed that when I boot up initially and the sound does not work, I can go into 'Recording Devices' and the sound will tempoarily show up in the DMX4 Config program. Once I close the 'Recording Devices' window the sound goes away. I tried disabling all of the other onboard microphones listed here, that didn't work. I notice there are two entries for the Antex USB Mixer Device. I even tried disabling those and I still have the same problem.
I have run out of ideas for today. Any help would be appreciated.