Tasks disappearing from users inbox...

[Rick Sample]

I have a strange inbox issue. 
 
I have a task that is sent to an org unit with 5 users. 
It gets sent correctly and users can see it in inbox for about a day 
then it just does not show in any inbox.
 
It is showing correctly as being in all 5 users inbox via SWI2_FREQ but

user does not display in inbox.
I take over the task, hit replace, and all can see the tasks again. 
Then, I look up the user via SWI5 and don't see any tasks!
 
Any clues is much appreciated... 
 
4.6c
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