rules wizard

[Trisha]

I'm trying to set up an email rule, but once completed
when I click "OK" to finish I always get a message that
one or more of my definitions is not complete. It is
complete, though. I've gone back over and over clicking
the underlined words and reenter my definition over and
over, yet the same message appears each time. I've tried
deleting the rule and starting over again, and that
doesn't work either. It used to work. Now it doesn't.
In fact I get the same message when trying to modify and
existing rule which has been working properly for months.

Can anyone help me repair this frustrating problem?
Thanks,
Trisha