Having masking issues - anyone seen anything like this before?

Here’s the scenario…

I’m building a splash page/interface for a website. The splash page was created using Actionscript 3.0 and TweenFilterLite. I’m also creating a lot of faux reflections using gradient masks. I’ve made a mockup you can view here. The problem is when you rollover over one of the tabs on the right and then rollover the text links to the left some of the tab reflections on the left plane almost disappear. Any ideas?