USB storage will not mount after Clockwork one click 2.5.5

[jmolhava]

Something happened to my Epic where it would not boot so I had to use Odin and flashed the DK28 stock image. It boots up fine at that point...

Then I ran the one click root/recovery that installs Clockwork recovery 2.5.1.0. It completes successfully, but at this point I cannot mount the SD Card via USB to load a custom ROM for flashing. I cannot mount USB in either Clockwork recovery nor when booted up and setting the USB mode to mass storage. Nothing happens in either case and on my computer it says "insert disk".

Has anyone encountered this and found a solution? Could it be a problem with my microSD card even though I can partition and format it without any errors?

Thanks