Advertising Box has CSS set to "display: none !important" even when turn on.

Hi,
I came across what I think to be a bug in the Directory theme Advertising.
When I turn on Advertising Setup / Sell Space and then turn on “Enable Sell Space” and also “Show Sample” I would expect to see samples of where the banner ads would be shown. However the banner ads have the following css rules applied.

.banner_250x250, .banner_300_250, .banner_300x250, .banner_300x250_2, .banner_300x250_3, .banner_468_60, .banner_468x60, .banner_728_90, .banner_728x90, .banner_ad, .banner_ad-728x90, .banner_ad_233x90, .banner_ad_728x90, .banner_ad_footer, .banner_ad_leaderboard, .banner_ads, .banner_ads1, .banner_ads_home, .banner_adv, .banner_altervista_300X250{display:none !important;}

I can override this setting by using custom css: .banner_468_60{display:block !important;}

I am just reporting it here so you can make a record of this.