This bug has been fixed in Release 14 Service Pack 3 (R14SP3). For previous product releases, read below for any possible workarounds:
There is a bug in the Mapping Toolbox 2.1 (R14SP2) in the way that the Map Viewer handles importing files on Mac OS X 10.3.x.
To work around this issue, load the file into the workspace using functions such as IMREAD or GEOTIFFREAD, and then import from the workspace into the Map Viewer by selecting "File-> Import From Workspace -> Raster Data -> Image..." from the menu bar of the Map Viewer. For example, to import the "boston.tif" file in the "mapdemos" folder, use the following:
[boston_X, boston_cmap, boston_R, bbox] = geotiffread('boston.tif');
boston_rgb = ind2rgb8(boston_X, boston_cmap);
Open the "Import Image Data" dialog by selecting "File-> Import From Workspace -> Raster Data -> Image..." from the menu bar of the Map Viewer. In the dialog, import "boston_rgb" as the image and "boston_R" as the referencing matrix.
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