Local Reports Issue

I'm having a nightmare issue with an application we sell.


The system is a three tier system.
We have world wide about 40 installations.


The system uses MS reporting services to produce reports.
All bar one of the reports are server based reports.
While the remaining one is kept local for performance reasons, as it prints a small label in high quantities.


Now this local report is working fine except in one sistuation.


One of our customers has 8 of our systems.
All 8 are clones. The client machines were ghosted to ensure everyone got the same. The databases all started off identical. The Server software is all identical.


However.. one of these systems is about once a week throwing an exception when it goes
to print this local report.
"An error occured during local report processing."



99% of the time it prints fine. Once the exception is thrown, the only way to make it work again is to quit
out of the application and reopen it, where upon it will start to work again.


All other information returned is soley stack traced from our program, pointing out the button that caused the report to attempt to render and fail.


Here in lies my problem.


I have had the client machine rebuilt from ground up.
The server software has been checked and is definitely identical to everyone else's.


I've taken a copy of their database and spent days trying to reproduce the exception with no success on our machines.
I've logged in remotely and spent hours working on their system to force the issue with no success.


I've also tried cutting the label down so that no fields are displayed, but the exception still remains...


The developers of the system have not been very useful.
The store staff are very fed up of ringing me and saying that big red error message is up again!


Any ideas would be highly appreciated. This has been going round in circles since december.


Do local reports show any more detailed logs anywhere, like the Server based ones?


Cheers
Chris