Sony has attempted to bar the use of counterfeit controllers on its PlayStation 3.
However, some users are claiming that the most recent firmware update has rendered an array of third-party pads, USB devices and PS2 to PS3 controller converters inoperable on the console.
On Tuesday, Sony claimed that cheap cloned pads had hit the market, and presented a risk to consumers.
"SCEA advises consumers to be cautious when buying PlayStation 3 Wireless Controllers from uncertain sources as the quality, reliability and safety of counterfeit products is uncertain, and in some cases, may be dangerous.
"It is possible that some counterfeit product may ignite or explode, resulting in injury or damage to the user, your PlayStation 3 computer entertainment system, or other property.
"Moreover, 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."
Following the release of the 3.50 firmware update this week, the scale of blocks may be higher than anticipated.
Some visitors to Sony's official message boards have claimed that even licensed third-party peripherals, such as some by MadCatz, have ceased to operate.
A number of USB flash drives were also reported as not working, as were adaptors intended to use other consoles' controllers with the PlayStation 3.
By contrast, many other users have claimed that their third-party peripherals and USB devices were entirely unaffected, leaving no clear picture as yet of what the update does and doesn't permit.