TCPIP problem as it applies to VM 5.2

[Steve Gentry]

I've got an emergency here, but I wanted to check with the list first before contacting IBM
We converted to VM 5.2 over the weekend and things have been running fairly well.
I'm getting an TCPIP message below"

 DTCREQ077I TCP/IP level (0520) does not match unknown level of client  <userid>

Then the users seem to drop connection and can't reconnect.
 
We use IBM PCOMM as our 3270 product on our pc's

Has anyone had this problem?

Thanks,

Steve