Screenie:

I should have been more specific. I want to see what hacks you have installed, so I can try them on my test board and see if I can reproduce the problem, thus perhaps uncovering the bug :)

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Thanks. I'll get to work on testing it.

I get this as well.

I do have quite a few plugins installed but none of the ones ThePimp does.
None of my installed plugins effect the admin_index_navigation hook location but I have a few that have their own XML's for added ACP nav function as well as a couple custom ones.

EDIT:
Also, if I add a custom SuperMenu, the error is displayed twice.

I have that same error.

Does it affect the way supermenu works anwyays?

I can only use 1 custom menu...

You're giving them all the same order, so they hide each other. Edit one and give it a smaller or larger number.

Okay, I think I fixed it. Try getting the zip and installing again (make sure allow overwrite is checked).

My guess is it had something to do with different php versions.

Still the same. I did an overwrite as well as uninstalling then reimporting the XML from the zip.

I am running PHP v4.4.1