OK, so you uploaded that file to "forumdisplay.php" and it didn't redirect?
This is important as that confirms this is not some server trick!
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The next thing I would do is make a new database and reinstall the forum software to the new database WITHOUT changing your existing site! You can create a new directory as the new copy can be anywhere as you really just need the database. You will need to install the same version you are running now so if you are running 3.6.11 don't install a 3.7.x or you will get errors.
Once it is installed and running, then go to the config file of the hacked forums and change the config file to have it look at the NEW database.
If you don't get this problem, then the issue is certainly in your database!
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