id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
1440	stack runs fail 'Unable to calculate transparency differences'	bills	eugene	"stack_id 189072 and 190958 yielded fault 5.
The message in the log was

   Unable to calculate transparency differences
 ->  ppStackLoop (ppStackLoop.c:72): Problem in data values
     Unable to prepare for stacking.

These runs have been set to 'drop'
"	defect	new	normal		ppStack		normal