jQuery slideDown in IE9 - content disappears after animation finishes

2 thumbs up with Nick's answer.

But by the time IE team will solve the problem, you will probably be on another project.

Here is what worked for me with IE7 that will certainly works on IE9.

On the DIV you set a slideDown effect, add this to your CSS:

 overflow: hidden;

Good day!

Honest suggestion here, don't fix it, report it as a bug to the IE9 team but don't spend any time fixing their bug.

This should be fixed in IE9 final, and the end result will just be wasted development time on your end...betas are buggy, they've always been buggy and will always be buggy...they wouldn't be called betas otherwise.