Make sure your team is setup properly.

type /jamba and go to team -
Make sure all toons in your team are listed there. If not add the missing.
Make sure the []When i change toons promote to master box is checked.
Then go to your follow tab.
Make sure Auto Follow after combat is turned on. And use Master.

Alt - F by default is follow in ISboxer/jamba and Shift Alt F is strobe.