When scrolling any form page you may notice the drop down boxes will disappear from the form unless you mouse over them to make them re-appear again.
This is a bug in Internet Explorer which is caused by the gradient effect of your website background and is mainly found in our ZSeries website product.
Until Microsoft releases a fix, the only way to resolve the issue it to disable the Gradient effect for your ZSeries website under the "ZSeries Design Center" --> "Additional Design Settings".
If you have an LE, PE, FS, or XE website the problem can be corrected using an image background. Our support staff will need to do this for you, simply submit a support request through your website administration referring to this article and request to have them recreate your gradient effect as an image.