This problem sometimes occurs after many stitching sessions without
exiting the program. Here is how one user described it:
Many of the toolbar buttons, panorama thumbnails and the main panorama
window below will not display properly or not at all. The fonts in the
save menu become bold as if the screen mode as changed. Usually closing
the application and reloading will solve the problem for another 5-6
sessions, but its a great inconvenience.