Have there been any recent server upgrades, such as PHP? UBB.threads6 shouldn't be able to be run on PHP5, it should throw a plethora of errors. If you're running on PHP5, you might ask your host if they have a server still running PHP4 (or consider upgrading as UBB.threads6 has been end of life since October 5th, 2006, with the last version having had come out just prior to that date).

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