I had that problem
I dont know if you already fixed
but this is my solution
1. Open the Crystak Reports XI
2. Go to "File > Page Setup..." option.
2.1 The Landscape option is disabled!!
3. Go to the "Printer..." button, below, in the "Printer Options" Group
4. Select a different printer, instead of the one that is already selected. (possibly is selected the Image Writer)
5. Press OK (closing printer options)
6. Press OK (closing page setup)
7. Open Again the "File > Page Setup..." option
The Landscape option should be enabled!!