Thanks for the feedback guys
'showmap' is working, but I didn't have the default data directory set right on that build, which will break it, and the program shortcuts ...
Re. performance issues on big maps.
I just did a 'longish' profile on a 256x256 map, accelerating the action by giving everyone a bunch of units from the Lua console. It spent an inordinate amount of time in the functions related to the hierarchical search... Something is indeed very wrong, but I wouldn't have a clue what at this stage, and it may take a while to track down the problem.