The DoubleWeaponXP does not work at all yet, and the math for the separate boxes for DoubleXP is off, so I currently suggest just setting your tokens and then use those tokens to purchase the 2xWeapon/Non-Weapon XP.
ALSO, YOU MAY HEAR BEEPING, blame @Jorndel
's DLL. That's what it does when checking for the process, but only make noise when the process is not running, but it only checks for the process related to whichever tab you have selected, so if you have multiplayer running but you switch to the singleplayer tab, it will beep until you select multiplayer tab.
Also, the multiplayer window was designed to be placed not to get in the way of anything on the barracks so you can watch as you unlock. ;)
The problem is, I was having problems finding screen sized, so it's designed for my screen, (1280x1024, small, I know) but as long as your screen is 1024 vertical, it should work perfectly, if larger, work okay, but if smaller, may not work and you may not be able to reach the close button, it's top of my priorities