If this is still an issue, Schnoob, load the ISBoxer configuration, clear all your settings and run the Quick Setup Wizard, selecting WoW as the game from all 3 pull-down boxes. Select your team members in the order you wish them to login, being sure to select your Main as the first char. On the screen where it asks about Keymaps and Jamba, select only the FTL DPS keys check-box.

In WoW, on each char remove any macros you created. Simply place the spell you wish to have casted on your hotbar - no macro.

Once all are logged in, press SHIFT-ALT-I (That's an i) to invite your team. If you wish for them to follow strobe, press SHIFT-ALT-CTRL-F12. If you want them to stop follow strobing, press SHIFT-ALT-CTRL-F11.

Start with this. If you want to move to a focus based approach, see classic hotkeying guides on how to do this. In ISBoxer, delete all the FTL DPS Keymaps and turn on Repeater, use Whitelist, select the keys you wish to be broadcasted.

Hope this helps.