Terraformer refuses to create SC4M file

[chimeran_dragon]

 

I have a custom map that is 16x16 large city tiles and it will load in SC4T but will crash after a few minutes of inactivity or will crash when trying to export a SC4M file.  The only thing I can think of is to reduce the the size of the region further.

I know that 27x27 will crash
I know that 20x20 will not load and crash
I know that 16x16 will load but will crash when trying to to export SC4M file
I know that the default region maps will export a SC4M file

What is the biggest map that will load and not crash when trying to export an SC4M file in large city tiles ?

I have seen some 10x10 maps but I want something bigger than that which will allow me to render more detail with an 8bit greyscale.

[Wiimeiser]

16x16 Large tiles is a 64x64 pixel Config.bmp, the default is 16x16 small city tiles, I don't think anything more than half that works *CoughPortMacquariecough*