Thanks Simon. It was indeed the Layers Tab in preferences. Seems a new showfile will automatically put it up to 32 layers, but opening an older showfile the default seems to be 1 layer. Will look at it in more detail when I get to my production machine, but I don't think I'll have too many problems getting the rest of the file to work in m257.

I'm using all 32 layers and 6 mixes with two TH2G on that particular machine, so unfortunately I need to have all 32 layers active.

Thanks for your help,

Kevin