A screenshot would help us to see the problem, but a few suggestions:
Click the 'View' tab on top left of window.
- Are the relevant options ticked for 'Project bar', 'Object bar' etc?
Are you on a new layout that you've just created?
Have you tried 'Reset Dialogs' from Preferences?
If still no luck, attach your .capx to your post and we can see the problem much quicker.