snsh

It's a crappy registry problem.
We had a similar problem with mom 4.3
trying to upload PLD over modem
after installing worldship 6.

Compare these registry values to your own,
taking care to customize modemname and phonenumber values
for the windows name for your modem,
and the dialing-prefix for your phone line.

[HKEY_USERS\.DEFAULT\Software\UPS\UPSL32]
"broker"="www.pld-x.ups.com"
"callCount"="0"
"callRetry"="5"
"detailLvl"="3"
"logLvl"="999"
"MaxGetIpFail"="5"
"maxReDials"="5"
"modemInactiveTimeout"="4"
"modemName"="Standard 56000 bps V90 Modem"
"phoneNumber1"="18005904857"
"phoneNumber2"="18005904857"
"phoneNumber3"="18005904857"
"phoneNumber4"="18005904857"
"PrimaryDNS1"="32.73.203.132"
"PrimaryDNS2"="32.73.203.132"
"PrimaryDNS3"="32.73.203.132"
"PrimaryDNS4"="32.73.203.132"
"SecondaryDNS1"="32.84.104.25"
"SecondaryDNS2"="32.84.104.25"
"SecondaryDNS3"="32.84.104.25"
"SecondaryDNS4"="32.84.104.25"
"userID1"="SecureIP.UPSS.VendOne"
"userID2"="SecureIP.UPSS.VendOne"
"userID3"="SecureIP.UPSS.VendOne"
"userID4"="SecureIP.UPSS.VendOne"

Also check the version number of ulink.dll.