If, when you click your email address or the Apps icon, nothing happens at all, then you have a problem with your browser, and need to try some troubleshooting:

• First, is your browser up to date? If not, then update it. Does that help? 
• If not, then next, clear your browser cache and cookies. Does that help?
• Do you use Windows 8? If so set your Win8 Theme to default. Some Windows 8 Themes break some browsers. Does that help? 
• If not, then check for bad browser extensions/add-ons next 

These will all disable your add-ons/extensions. If that fixes the problem then you need to disable all your extensions/add-ons manually and then add them back till things break again, and then you will know you have found the culprit! Disable that particular add-on/extension permanently to solve your problem. 

It that doesn’t help either, then start Gmail without any of your enabled labs – sometimes they can cause conflicts. Use https://mail.google.com/mail/?labs=0 to do that

If you still have the error, then temporarily disable your virus checker (if you have one) and see if that changes matters

If nothing at all helps, then try another browser to see if the behaviour persists

You can also switch to Basic HTML and see if the behaviour persists – use https://mail.google.com/mail/?ui=html to do that

 Thanks