If you have the iPhone (iMT) plugin installed make sure you either remove it completely or upgrade it to the latest version before attempting an upgrade to MovableType 4.2.
If, like me, you have a penchant towards installing plugins and then forgetting about them completely, you can end up in "navigation hell" post-upgrade. (I don't even own an iPhone!)
With the old version of the iPhone plugin still installed your upgrade will appear to have completed successfully, but you won't be able to access most of the navigation menus inside your new MT 4.2 Pro install.
The simplest fix is to remove the iMT directories inside both your plugins directory and your mt-static/plugins directory.
Once you've done this you can then actually make use of MT again!
Thanks to Beau for helping resolve this for me on a Sunday afternoon (even though he's currently in Japan and was on his way to bed!)
More on this on the MT forums
If, like me, you have a penchant towards installing plugins and then forgetting about them completely, you can end up in "navigation hell" post-upgrade. (I don't even own an iPhone!)
With the old version of the iPhone plugin still installed your upgrade will appear to have completed successfully, but you won't be able to access most of the navigation menus inside your new MT 4.2 Pro install.
The simplest fix is to remove the iMT directories inside both your plugins directory and your mt-static/plugins directory.
Once you've done this you can then actually make use of MT again!
Thanks to Beau for helping resolve this for me on a Sunday afternoon (even though he's currently in Japan and was on his way to bed!)
More on this on the MT forums

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Hi!
I upgraded MT 4.1 to 4.21 having the iMT Plugin installed and have this problem described here. On Firefox or Safari the drop menus inside the MT4 admin won't even show. It does work on IE7 but the templates won't apply correctly, it doesn't matter what template I choose, only one column of contents will show, followed by the categories, etc right below..
I have removed the iMT but the peoblem persist. Any idea how to solve this?
Thanks in advance,
Enrique
Enrique
Did you completely delete the plugin's files?
Michele
Hi Michele.
I did delete all files and folders of the iMT plugin and I keep having problems.
Thanks for the quick reply!
Enrique
Enrique
From what I can remember deleting ALL the plugin files allowed me to do an upgrade without any other issues. I'd suspect that you might have other plugins installed that could be causing issues...
Michele