I was just viewing the Bug Reports board and then clicked on the Mark Read button at the bottom of the page and got the following error:
Fatal error: Uncaught Error: [] operator not supported for strings in /homepages/31/d500994839/htdocs/_pmx/Sources/Subs-Boards.php:394 Stack trace: #0 /homepages/31/d500994839/htdocs/_pmx/index.php(112): MarkRead() #1 {main} thrown in#: /homepages/31/d500994839/htdocs/_pmx/Sources/Subs-Boards.php on line 394