If you send me the mask, I'll have a look and see if I can see the problem. As a work around, you could try using ncsmask in CCP4 to make your mask in the first place. Kevin Johannes Romir wrote: > Dear Cooters > > I am using coot 0.3.1 for OS X, and it seems coot has problems while > displaying maps of masks, created with mama of USF. I converted the > maps to ccp4-format and the map is displayed, but parts are missing. > It looks like the map was sawed of two times in a 90 degree angle. The > map itself works fine on O or pymol. Has anyone else encoutered this > problem? Any suggestions? > > (I will gladly supply pictures and the maps) > >