Astek,

Thanks for the response, I have since realised this about the EPROM, is there any reason that the EPROM cannot be disabled? I would prefer the values to be loaded from the config as standard. When i get back from work i will update my firmware as the first post states.

PS I am also from the UK, i have got a few spare bits of glass that i have tried, so i am pretty confident there is no warping, i have also tested using a straight edge etc. I am using 4mm Toughened Glass from a local glass cutter (small business). It is only £7 a sheet for me and he cuts it to size (475 x 475mm) with a chamfer. Maybe worth looking into if theres anywhere local to you if you are struggling to source glass. I might also try a sheet of aluminium (fairly cheap online for 500 x 500mm sheet).

Cheers

Alex