assertion failures from ppSub

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On 2011-04-23 we got two repeating faults from ppSub. The two stack traces and the ids are given below. The runs were completed by setting quality to 42 and fault to zero.

(warning raised 72300 times)
       Kron Radii vs FWHMs 1: fwhm: 4.801629, kron 99.767906
       Kron Radii vs FWHMs 2: fwhm: 18.929829, kron nan
       Windows from Kron Radii: 274.361755 for 1, nan for 2
   Data error code: 36b6
Error in subtraction:
-> pmSubtractionStampsFind (pmSubtractionStamps.c:462): parameter is out-of-range
    Error: size is 0 or less.
-> pmSubtractionStampsSelect (pmSubtractionStamps.c:402): parameter is out-of-range
    Unable to find stamps.
-> ppSubMatchPSFs (ppSubMatchPSFs.c:446): Problem in data values
    Unable to match images.
-> ppSubLoop (ppSubLoop.c:110): Problem in data values
    Unable to match PSFs.
found 0 leaks at ppSub
Unable to perform ppSub: 5 at /home/panstarrs/ipp/psconfig//ipp-20110406.lin64/bin/diff_skycell.pl line 463.
Running [/home/panstarrs/ipp/psconfig/ipp-20110406.lin64/bin/difftool -diff_id 123766 -skycell_id skycell.077 -fault 5 -adddiffskyfile -dtime_script 32.9999819397926 -hostname ipp049 -path_base neb://ipp006.0/gpc1/MD06.nightlyscience/2011/04/23/MD06/skycell.077/MD06.skycell.077.WS.dif.123766 -dbname gpc1]...





  No valid data in input vector.
   (warning raised 32700 times)
       Kron Radii vs FWHMs 1: fwhm: 2.924699, kron nan
       Kron Radii vs FWHMs 2: fwhm: 13.610703, kron 49.518742
       Windows from Kron Radii: nan for 1, 136.176544 for 2
     Found 2 stamps
     Stamp 334 (5735,4137) is within the region border.
     Stamp 418 (5730,4782) is within the region border.
failed to generate stats
Backtrace depth: 8
Backtrace 0: p_psAbort
Backtrace 1: pmSubtractionStampsGetWindow
Backtrace 2: pmSubtractionMatch
Backtrace 3: (unknown)
Backtrace 4: (unknown)
Backtrace 5: (unknown)
Backtrace 6: __libc_start_main
Backtrace 7: (unknown)
ts.
Unable to perform ppSub: 4 at /home/panstarrs/ipp/psconfig//ipp-20110406.lin64/bin/diff_skycell.pl line 463.
Running [/home/panstarrs/ipp/psconfig/ipp-20110406.lin64/bin/difftool -diff_id 123629 -skycell_id skycell.1.08 -fault 4 -adddiffskyfile -dtime_script 50.0000104308128 -hostname ippc26 -path_base neb://ipp013.0/gpc1/STS.2010.b/2011/04/22/STS.V3/skycell.1.08/STS.V3.skycell.1.08.WS.dif.123629 -dbname gpc1]...