The ECF2 skin can be selected at bottom left in the spinbox, or in your profile Settings. If you do it in Settings it may work better for some people, depending on the use of multiple browsers etc. Note that if you are not logged in then none of your settings work, you need to pick ECF2 in the lower left spinbox.
If things seem to be messed up then you might need to clear the cache and cookies in whichever browser is affected. It's generally a good idea to have more than one browser available. Firefox and Opera are good ones, Chrome if you don't mind Google knowing everything about you. If you want to use Internet Exploder then you have to be prepared for some issues. Make sure to have a good antivirus such as Avast, and a good firewall such as Online Armor.
One reason for using two browsers is that you can have one with multiple plugins, to do all sorts of additional jobs - Firefox is the best choice for this; and one with no plugins, such as Opera, which will load faster and also act as a check to see if it's a plugin causing a problem you might experience. One can be logged in, one as guest.
