Your texture itself looks pretty normal, so it's most likely your image output settings affecting the export in an undesirable way.
First off, go ahead and grab the most recent version of the exporter.
http://www.worldviz.com/support/download/
1. Are you embedding textures in your exported files, or are you having them save out to a subfolder? (image output settings typically only affect textures saved to a subfolder instead of the external file)
2. If you are saving to a subfolder, what format have you chosen under
Texture State -> Texture Format?
The settings used when saving images from Max are accessed when exporting and storing images outside of the exported file. Typically this should have no effect on embedded images. These output settings can currently be accessed from any image saving dialogue. A much more direct way to modify those settings is currently being tested for the next release of the OSG exporter.
The correct setting generally works out to be the one that results in an 8 bits per channel RGB or RGBA, though the dialogs are set up a bit differently for each format.