gonetwork,
First, the Doc Subscription is not a promise of support. You are paying for the documentation (that Nick put countless hours into) to fully realize the features and capabilities of CB and hopefully, resolve most any problem you have. It's also a show of support, and the developers are very grateful for that as it keeps CB free and allows further development. As a thank-you, they offer you pre-releases before the public gets a chance to use them.
That said, try using a website development addon for IE that will help you determine which CSS element that needs to be changed. If you're using a non-default editor, the settings may also affect how the field appears in IE, but the documentation or forum for that extension should help if that's the issue.
Feel free to report back if you still have problems.