The most recent PlayStation 3 firmware update has disabled certain third-party pads, USB devices and PS2 to PS3 controller converters, users have claimed.
Scores of people have posted on Sony's official message boards that their third party add-ons are no longer working.
When the Blu-ray 3D-friendly firmware update went live earlier this week, Sony explained, "SCEA does not support continued functionality of counterfeit or unlicensed controllers in system software updates and these devices may cease to function in the future because of system software updates.
"SCE and its affiliated companies disclaim all liability for any loss or damage suffered by you or any third party through the use of counterfeit or unlicensed products."
However, there have been a number of complaints that some above-board MadCatz pads and Guitar Hero accessories no longer work either.
We've asked Sony for an explanation and will update when it gets back to us.