Quote - Also to see if its a Carrara and the Tiff format version that GIMP uses, try this.  Get irfanview (one of the best little image viewers/resizers etc and its free, at http://www.irfanview.com/

Open the file and save as/export to .tif again, also save out to another lossless format say PNG or BMP, then open that file and re-save as TIFF and try each one, to see if it has the same issue.  if it doesn't then it narrows down what is happening.  I would still like to try it, if you can put up a sample somewhere.

I'm on a Mac OS10.4 but I've tried your suggestion with other similar software but for Mac I will try to get a sample on. at work now.

MacBook Pro OSX El Capitan Ver 10.11.6