For some reason the "plugin" menu item vanished from
coda. It should be near the item "window". Any idea how to fix this?
I'm running Mac OS x (ver 10.7.5).
Never seen that, but I'd suggest reinstalling. If it persists I'd go in a delete all your plugins (maybe one is corrupt) or temporarily relocate them.
Plugins are stored in: ~/Library/Application Support/Coda 2/Plug-ins/
If you don't have any plugins, it will be invisible. Try installing a plugin and see what happens ;)