Nothing wrong. AE has never opened up on the last project. You can use keyboard shortcuts to open the last project however. Just mash down on all of the modifier keys on the right side of the keyboard and then press P. (Cmnd/Ctrl + Alt/Option + Shift + P)
You'll find all common keyboard shortcuts right next to their Menu functiions. IOW File>Open Recent Projects>The top project will have the shortcut.
Hope this helps.
Sorry, I meant that when I open a saved project, it used to open in the state i closed it with all the comps i was working on open. Now the comp viewer is empty and i have to re-open them from the project library...
sorry to not be clear.
You have probaly re-arranged your workspace or created a custom one and the last saved state of the workspace was with teh comp panel closed. Assign a new workspace/ reset to "Standard" or trash your workspace files in your user home directory so AE will re-create them fresh with factory defaults....