How can I get the F8 and F9 function keys in FM 10.0 to work like they did in FM 7.1?

We just purchased the Adobe Technical Communications Suite 10.0 and have FrameMaker 10.0 installed. What's frustrating is that F8 and F9 work "sometimes" to provide a shortcut to text formatting and paragraph formatting, but they don't work consistently. Is this a bug? I need a fix that would get them to work consistently. (Alt+OPC to format text with the default font is another key combination that works, but it doesn't work consistently.)

thanks in advance!

ChristyG