This thread shed a lot of light into this odd problem for me.
And if you're like me... wondering how to even GET to Gedit's menu, if it keeps hanging after it shows up on screen, you'll want to know there's another way to disable the file browser plugin.
If you've already installed it, open the Configuration Editor (use Synaptic to add it, if you haven't)
Browse to: /apps/gedit-2/plugins/
From there, just double click on "active-plugins" and find the line listing filebrowser and click remove. After that, Gedit should load fine.
I was kinda used to that plugin... I do hope that's fixed sometime soon.
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