I am not sure if there are any specific limits, but I have noticed that frequently the IMAQ window will be clipped to fit the screen during an auto resize. I have displayed 1600x1200 images before on a 1600x1200 screen with no problems. My solutions would be: set the screen resolution higher, or use window resizing to manually set the dimensions of the window. If you can't display the entire image at one time, turning on scrollbars is another option that works well.
Bruce
Bruce Ammons
Ammons Engineering