This issue doesn’t only relate to the update of the browser but can also be caused by several other factors such as bad cache/cookies, hardware acceleration etc. Before you read on, attempt at restarting your computer and check the issue again. If it still occurs, you can move on with the solutions. A restart helps reset the temporary configurations and if they are broken, a simple reset will fix it.
What causes YouTube not to go full screen?
Like mentioned before, this scenario is caused by several different reasons ranging from problems in the browser to internal system settings such as hardware acceleration. Some of the reasons why this error occurs are but not limited to:
There are two flash players installed in your browser. This is the most common cause why the window doesn’t go full screen because the two of them conflict with each other.If you are using dual monitors and YouTube doesn’t open in full-screen, it is probably because of themes installed on Chrome.There is a discrepancy in your stored browser cache and data. We can reset your cookies and cache and see if this solves the issue.
Before proceeding with the solutions, make sure that you have an active internet connection and are logged in as an administrator.
Solution 1: Checking Flash Player and content settings (Chrome)
People using Chrome might not know this but they might have two instead of one flash players installed in their browser (older version). This happens rather automatically if you install different versions and gets incorporated inside Chrome. We will navigate to the settings after disabling one of the flash players, check if this solves the issue. In the newer version, if you don’t have correct content settings, you might experience this error. Note: You can also try disabling hardware acceleration and see if this solves anything.
Solution 2: Checking Full Screen API (Firefox)
Firefox users reported that they fixed their YouTube not going full screen by enabling the ‘full-screen-api.enabled’ option in the browser’s settings. This can be disabled without you even knowing it by automatic scripts or preferences set by you earlier on. We will check these settings and change the option if it is disabled. Note: There is also a workaround where before clicking on the full-screen button on Chrome, make sure that your Chrome window is minimized. When it is minimized and then you click the full-screen button, it works without any issues.
Solution 3: Checking in Incognito mode and clearing browser data
Now we will diagnose if the problem is present at your browser’s data end. You can easily check if YouTube is properly displaying the web page in an Incognito mode. If it is, it means that there is some problem with your browser’s data and not the browser. We will clear it and then try again. Make sure that you export or backup your information before erasing it.
Solution 4: Logging out of Google profile
If all three solutions don’t work, we can try another workaround in which we log out of your user profile. This workaround signifies that either there is something wrong with the profile mechanism in your browser or your private profile has wrong preferences set. Do note that all your favorites, browser data, etc. will be removed when logging out.
Solution 5: Reinstalling Chrome
If all the above methods don’t work out, you can try reinstalling Chrome. This will remove all the current files and folders of the application and force to install new files when you install the whole package. Remember to backup all your bookmarks and important data before following this solution.
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