I recently upgraded to 11.10 on my desktop, but afterward all the custom themes I added and the MediaWiki syntax highlighting were gone.
For the themes, I forget where I put the files, but the syntax highlighting was downloaded according to the author's instructions so it is still at ~/.local/share/gtksourceview-2.0/language-specs/
What gives? I tried removing the files/directory and starting over, tried moving the directory to ~/usr/share
... instead, tried restarting, tried updating my packages. No luck.