I believe there are known (to the Enjin staff) issues with IE9. You could try putting in a Support Ticket and let them know about your specific problem.
I'm not seeing that flaw in any browser, including IE9.
Edit - note that the header is rendered in flash, and any issues might in fact not be related to your browser, but to your flash plugin. For many reasons, you should ensure that your flash plug-in is up-to-date.
The mystery thickens. So my version of flash is the most current available from their site. The second computer in my office, running Vista, shows the banner just fine. Perhaps it is indeed an issue with IE9. I will contact support. Thank you.
I'm having the same problem, it seems its not to do with browser choice but with screen zoom level. I usually view at 125% (dodgy eyes) and the black or transparent band appears at anything above 100%. Anyone know a fix, maybe using a HTML module instead of the Header module? If this would work does anyone know the coding?
Just managed to do it myself using a HTML module. First you have to make your header image and put the border on it that you use on your site, so you need a little bit of image suite experience. Upload image to Photobucket for eg and get the Direct Link". Go to edit a HTML module of your making and put this code in HTML Source:
<IMG style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; BORDER-TOP: medium none; BORDER-RIGHT: medium none" title="" alt="" src="PUT YOUR LINK TO YOUR IMAGE HERE"width="100%" height="100%">
Remember to save and then go to "Display Settings" and click "Hide Container Graphics" and save. Now it should work on any resolution.
Update on this one. It seems that, in my case, the issue was with how IE9 or the container module handles zoom controls. As my eye sight is not the greatest and my monitor is at a very high resolution I commonly set my browser zoom to a slightly higher level. This created an interesting effect where the background image, the gallery, the avatar images, etc. all increased in size proportionately to the framework, but the banner image remained the same size creating, who guessed it, a blank area around the image. By returning the zoom setting to zero the site got a lot smaller but the banner now fits perfectly.
As a side note, it is also interesting to notice that the default settings, as far as I can tell, set the body fonts of your site to a hard code point so that browsers cannot increase them. Anyway, I hope that this simple solution will also help out a few others that might run into this problem.