Ok so checking my router with v1.04. Default settings are un-checked enable box and the rest is either blank or has default place holder values.
I have 2 rules for my QoS, one for XBL and the other for all other devices...when I set them up, I entered in the values I needed first, check the enable box then saved settings. I get a reboot now or later option. I usually select Later if I need to configure the router more...
I use IE for Windows and Safari for Mac OSX. I don't think I had compatibility mode enabled for IE when I used it last there. You could try this though if needed.
Let us know what version of FW version you have loaded and what browser your using.