FrameMaker locks up when trying to Publish

Using FrameMaker 15 with Windows 7, why does FrameMaker lock up when trying to Publish? I can select the format I want, but when I try to change settings, and select Style Mapping, it closes my Publishing options and then nothing happens. If I bypass the setting options and select Generate Selected Output, it creates a file in the location I indicated, but it won't let me view the output file. Nothing really seems to be working for me.