iprntcmd hangs in login script

When executing iprntcmd.exe multiple times in a login script, the executable hangs.

Upgrade the iPrint Client to version 4.28 or later.

And example script that would duplicate this problem is:

@iprntcmd -a ipp://printmanager.company.org/ipp/printer1
@iprntcmd -a ipp://printmanager.company.org/ipp/printer2
@iprntcmd -a ipp://printmanager.company.org/ipp/printer3
@iprntcmd -a ipp://printmanager.company.org/ipp/printer4