Effective from the August 2012 competition (entries due on Tuesday, 3rd July) we have updated our rules to follow the dimensions laid down for the VAPS interclub competition:
The maximum horizontal dimension allowed is 1400 pixels and the maximum vertical dimension allowed is 1050 pixels.
Please note that these are maximum dimensions. If you have already prepared an entry at 1024×768 then it is perfectly fine for you to enter it into the competition.