I'm currently in possession of three Motorola STB's - the DTH335, DTH325 and DTH310 and two remotes (for the the 335 and 325 only).

Interestingly the remotes appear to be identical in their IR codes, i.e. both the 335 and 325 remotes will control all three STB's.

TiVo however (using the Motorola325-4.tcl IR file) will only control the DTH325 and the DTH310. TiVo refuses to change channels on the DTH335.

My suspicion is that the problem is one of two things...
- either the codes in the Motorola325-4.tcl IR file are slightly off - the DTH325 and DTH310 don't care and recognise them but the DTH335 is just being fussy, OR
- the IR receiver in the DTH335 is fussy and insensitive.

I actually suspect the problem is the DTH335 IR receiver because I had to play around moving the IR transmitter I have in the cupboard where the STB is (beams IR signals from my lounge) to get the Sky remotes to change channel on the DTH335.

Given the above I'm just going to swap the DTH335 for a Pace unit.