SEP debug + iSeries Commands Log problem

It seems that if I set a service entry point (SEP) for PGMA, and then
switch to the iSeries Commands Log and run 'call pgma', I always sit and
wait for a while, then get the "Your request is taking a long time ... do
you want to cancel?" message. I chose not to cancel the first time, and
eventually ended up forcing the workbench to close. Fortunately,
cancelling the request seems to work smoothly.

Is this expected behaviour? Can I do anything to fix it? This is a
non-interactive program, so I don't think I should have to run it from a
terminal emulator for the SEP to work.

WDSC 7.0.0.1
I am missing the following PTFs, though they seem unrelated based on the
cover letters:
SI25870
SI23909

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