I solved it. It did turn out to be a problem with my DDS, so in case anyone has the same error in future here is the setting to use in GIMP when creating the DDS:
In the DDS save dialog, for Compression choose 'BC1 / DXT1'. I had to ensure that my image dimensions were multiples of 4 (as the EQ2Map tutorial says) before this would work.
It's a bit weird that having a problem with one of the DDS files for a map should break lots of other maps (I think it broke all maps which weren't included with the game, so Freeport was OK, for example, but zones for which you need EQ2Map weren't).
Thanks to those above who helped!
Now to create another thread containing my new map!
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