You cannot save Apex of VF pages directly in a Production environment. You need to save them in a sandbox, then deploy. From the screen cap, I see you're accessing the instance ap15 which is a production instance (Asia Pacific).
Note: I've heard others suggest you can edit VF in prod, but that is not my experience.
If it gives no indication of any problems (no icon on the problems tab) and it also gives no indication that it's still trying to save - I'd say copy the VF page and close the dev console. I'm not exactly sure what the issue may be, but the quickest and best option is to just close and open it again.
Refresh your salesforce home page to make sure you're ...