Resizing view leaves black bar - Adwhirl with Tabbar

[mouser58907]

What I'm doing is animating in the new ad, but it does it even if I don't use animation. First off here is my code.

	CGSize adSize = [adView actualAdSize];
	CGRect newFrame = adView.frame;
	newFrame.size = adSize;
	newFrame.origin.y = 20;
	newFrame.origin.x = (self.view.bounds.size.width - adSize.width)/ 2;
	adView.frame = newFrame;
	
	CGRect tabFrame = uiTabBarController.view.frame;
	tabFrame.size = CGSizeMake(320, 480-20-adSize.height);
	tabFrame.origin.y = 20+adSize.height;
	uiTabBarController.view.frame = tabFrame;

I used NSLog at the beginning of that block to see what the tabbar controllers frame is, then at the end printed the size/frame of the adbar, and the tabbar after being changed. Here is the output.

 Tab Bar Controller Frame: {{0, 0}, {320, 480}}
 Ad Size: {320, 50}
 Tab Bar Controller Frame: {{0, 70}, {320, 410}}
 Ad Frame: {{0, 20}, {320, 50}}

 Tab Bar Controller Frame: {{0, 70}, {320, 410}}
 Ad Size: {320, 48}
 Tab Bar Controller Frame: {{0, 68}, {320, 412}}
 Ad Frame: {{0, 20}, {320, 48}}

Looks correct doesn't it? Well what I get is 20px status bar up top, 50px for the ad (if its a 50px ad), then a weird black bar beneath the ad covering up the first row in my tableview. Then underneath is everything as it should be. However if I switch to a different tab and back the bar is gone and everything works as it should.

Here is what it looks like.Click Here

Thanks for your help.

[mouser58907]

I should add, it only happens the first time. I initialize the adbar off the screen, and then slide it down when an ad is received. Here is the results of the adbar's frame before and after the ad is recieved.

Ad Frame Before Animation: {{0, -30}, {320, 50}}
Ad Frame After Animation:     {{0, 20}, {320, 50}}

EDIT - It happens even if I do not initialize it off the screen.