Having a real hard time with maximizer switch. I cant switch between windows. I have 5 windows across two monitors.
Shift F1 for my main, Shift F2 for my first mage, shift F3 for my shaman healer, Shift F4 for my second mage, and Shift F5 for my 3rd mage.

When i try and switch the windows by pressing the hot keys. Sometimes it works, sometimes it doesn't. Any idea why?

Also i dont understand the focus approach to well, so these are the macros I have been using for my characters. Please advise

Paladin tank: main. no macros

Mage 1 : /target imnotblueirl
/follow imnotblueirl

/assist imnotblueirl
/cast fireball

/assist imnotblueirl
/cast arcane intellect

/assist imnotblueirl
/cast fire blast

Mage 2: /assist imnotblueirl
/cast fireball

/target imnotblueirl
/follow imnotblueirl

/assist imnotblueirl
/cast dampen magic

Mage 3: /target imnotblueirl
/follow imnotblueirl

/assist imnotblueirl
/cast fireball

Shaman heals: /target imnotblueirl
/follow imnotblueirl

/cast earthbound totem

/cast stoneskin totem

/target krillinn
/cast healing wave

/target imnotblueirl
/cast healing wave

/target polymorpheus
/cast healing wave

/target larzcanheal
/cast healing wave

/target squishylarz
/cast healing wave

All my chars are around level 17. I also have the left arrow key binded to strafe left so that i can break follow whenever i want.
These macros were working ok for me, until i tried my first 5 man dungeon. I wiped at the first boss because i could not keep the tank alive with heals. Any suggestions or recommendations?