Okay, first and foremost... please stop using PHP tags because they create text that is unable to be read when using dark colored themes -- I happen to be using a dark colored theme. You used the correct [code] tags in your first post, but then used [PHP] tags in the next two.

I just copied and pasted your macros into mine and they work perfectly fine. Everything swaps as it should and my windows continue to run at the FPS they're supposed to. I do not see any adverse effects at all, but I am also only running 2.

I'm going to take these level 1's to Stormwind and then add a third trial account so that I can try it with 3 accounts like you did.