USB Serial not working in .NET application Windows 10 PRO

USB Serial not working in .NET application Windows 10 PRO

USB Serial not working in .NET application Windows 10 PRO


Audience

Having a strange problem. I have a .Net app which scans barcodes and retrieves products from a cache file. I am using a Zebra DS457 scanner configured for USB com port. This has worked fine on all of the computers I have configured until now. I have a brand new ELO 22" iSeries computer that came without an OS. I installed Windows 10 Pro and all of the latest Windows Updates.
After configuring the DS457 to USB Serial and specifying the com port I installed my custom application. When I scan a product barcode it beeps 4 times indicating no application received the scan.
Trouble shooting so far:
I reset the scanner to factory defaults and scanned into notepad. WORKS
I reset the scanner to serial and scanned into Hyperterminal. Works
I contacted ELO and downloaded their driver back. I installed all of their drivers.
I installed Zebra 123Scan. Everything seems to work as expected.
I feel like something is interfering but I am not sure what it could be.
Thanks
cf