1. Produced a pdf report by activating an operation from an object form.
2. Displayed report in a separate browser window and kept the window open.
3. Produced another report for another instances of the same object.
4. Displayed report in another window. It was identical to the first report already open. Problem.
5. Closed both report windows, re-displayed report and it was for the correct instance.
Is there any chance you are looking at the report for the first instance at the end of step 4? Could you, please, repeat the first 4 steps and then compare the two report windows to confirm they are, indeed, identical.
We cannot reproduce this problem on our systems. Also, it apparently does not occur when using Internet Explorer. Perhaps this is something specific to Mozilla.