Chris has moved on, but for those interested, this was fixed by going old school...
RS-232 touch screens
PS2 Keyboards and Mice
Very long VGA leads
and Some CAT6 tielines terminated into krone blocks, chop the RS-232 and PS2s in half and punch them into the krones, you can send them over great distances, works very reliably!
The only thing to note is that the RS-232 is quite fussy, you'll need to go via function, rather than by colour order, so within a pair TX and RX, CTS & RTS and so on, follow that and all is good.
Just a shame that RS-232 touch screens are not as common as they used to be.
Epsom Hospital Radio