"import swc" and then Flash crashes

I have the following problem:

After I pulled the component on my movie clip and select an effect at FlashEff2 panel --> a small window appears with the comment: "import swc" and then Flash crashes.
I work on win 7 with Flash CS5.

Can someone help me?

Thanks in advance.

Normally, that shouldn't happen. Could you please give me exact details of your scenario? and did you have installed the last version of the component?