Naw, you really didn't want to see the subclass list. Did you?

Sometimes, and I wish I could figure out why this happens, when I'm creating a new record the drop down list displaying subclasses will drop down, I'll click on a subclass name, the drop down collapses and goes back to not having been selected.  Then I click on the drop down again and it refuses to budge.  Grrrrrrr.  So it's back to the keyboard and click the down arrow until the subclass I want shows up and then I can move forward.  Strange, but true.  By the way, I'm almost exclusively a Firefox guy.