Portal module heading glitch -- anyone else had this problem?

Has anyone else who uses Firefox or Explorer, and is on phpbb2 had the following problem?


Above the 'statistics' module in the portal has appeared the following:

< class="" height="25">

The module's heading bar has disappeared, so the text "statistics" is on a barren background.

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If you were able to solve this, (even if for modules other than the statistics one), can you please explain how?
I encourage anyone who still has this problem to post here.

Thanks.