It really doesn't make sense to post support requests in a news forum.
Download the latest software, set output to "DVI" or "DVI+VGA", choose "reflash all" to make sure that any artefacts of an older version are overwritten, then you'll surely have DVI signals enabled for all screenmodes. Files are located on http://wiki.icomp.de/wiki/Indivision_AGA_MK2
and you should download the V1.1 tool (which includes the 2.6 cores) and then the V1.2 tool for use with the 2.6 cores.
Anything beyond that: File a direct support ticket on icomp.de and link to or include all support mails that have been exchanged with your reseller, so we don't do double work.