Shockwave problem

I may be an old stick in the mud, but I still like Netscape for my e-mail. For the past several weeks, I get a message "Shockwave Flash - The plugin has performed an illegal operation. You are strongly advised to restart Navigator" If I close the message, Netscape crashes, and if I restart, I get the same message. There is no indication of what the illegal operation is or maybe I could fix it. It seems to happen if there is anything on the page that has video with it. Normal text messages are usually OK. I have tried un-install and re-install, but no success. I know Netscape is an antique, but I still like it. Any suggestions or should I just bite the bullet. Thanks.

Lynn