Problem(s) Encountered:

At the beginning of the night, osctrtask would hangup after displaying the acqimage and marking the target. However, after leaving it alone for 5-7 minutes, it worked itself out and continued as normal. Later in the night, instead of hanging up and resolving itself, the following messages sprung up:

Located 1 objects in image acqimage

Exception in Tkinter callback

Traceback (most recent call last):

 File  /usr/custom/Anaconda-2.1.0/lib/python2.7/lib-tk/Tkinter.py , line 1486, in __call__

   return self.func(*args)

 File  /usr/custom/Anaconda-2.1.0/lib/python2.7/site-packages/stsci/tools/editpar.py , line 1245, in execute

   self.runTask()

 File  /usr/custom/Anaconda-2.1.0/lib/python2.7/site-packages/stsci/tools/editpar.py , line 1754, in runTask

   self._taskParsObj.run(mode=''h'', _save=1)

Solutions:

Found that imexam was the source of the trouble.  For some reason its parameter file ~/iraf/uparm/tvimexae.par had become wildly corrupted and ballooned out to 129 Mbyte, when it''s ordinarily less than 1k.  I erased the

corrupted version and replaced it with a fresh one, and it seems to work now.  After one successful run through osctrtask, the tvimexae.par file still looks normal.

I have no idea how this could have happened.  (Thor)