I have been having this problem for awhile now, just wanna see if anyone else has had it and/or fixed it.

Whenever I log into another server other then my main one, almost all my addons dont load/work.  Fubar loads, carbonite loads, but only like 2 fubar addons will actually show up.

When selecting a character on any server, whether your main or an alt, make sure, on the character select screen, you click the "addons" button at the bottom left, and enable any addons you want for that/those characters. Also, turn on "load out of date addons."

I have done that and when i click on fubar in game, its say they are loaded but do not show up.

when wow loads up im getting 'error loading LoadOnDemand plugin *******

Try removing Carbonite.... it is causing tons of issues since it moved to payware. Yes, remove it, try your other addons, then post back.