Re: Troubleshooting a stalled procedure

I'm searching for ideas on where to look to find what I need to correct.

Environment: IBM i at 7.1 WDSCi 7.0.0.8 (7.0.0.20090225_1508) PTF's are usually pretty current

Brief description: I've created a couple modules (WS3PRVSN and WS3PRVSN05) that comprise the "plumbing" to retrieve data from a web service. A web service driver module (WS3GetRgDv) loads the input data structure, executes the call to the web service, and parses the results from the data structure returned by the web service. These three modules are in a service program.
A test program (TESTSTUFF) was created to pass the inputs to the web service driver.

Issue: The test program calls the web service driver procedure, the SEP debugger shows that the called procedure loads, but hangs without advancing to the first executable statement. WRKACTJOB show status RUN; call stack confirms that the intended procedure is at stmt 2100000001 (whatever that is), but nothing else happens. I expected the first executable statement (one that tests for the presence of an optional parm) to execute, but the debugger doesn't get there.

The test program runs in activation group, *NEW, and the service program was created to run in *CALLER. All this is in my development environment, so I'm not in contention with anyone else.

I've confirmed that all the modules, the service program, and the calling program are freshly created. WRKOBJ shows everything appears to be in place.
I call TESTSTUFF from a command line of a newly-started 5250 session, so there shouldn't be any zombies from prior attempts causing trouble.
I've confirmed through stub testing that the web service plumbing programs are sound and return results with the same inputs my test program uses. That shouldn't be an issue at this point, because I can't seem to get that far.

Ideas?