animateClass does nothing if there are no styles changes

three styles...

.content_1{color:#FFFFFF;}

.content_2{color:#FF0000;}

.content_3{color:#FFFFFF;}

Two of these classes have the same attributes which seems to be a problem. When swapping from content_1 to content_2 then content_3, then back to content_1. The final content_1 is not added it sticks on content_3 from then on.

But if I change it to this..

.content_1{color:#FFFFFF;}

.content_2{color:#FF0000;}

.content_3{color:#FF00FF;}

...everything is fine.

using this

$("#content").switchClass('content_1','content_2', 1000);