"The browser's cache is full and may affect your use of Gmail." "Solutions _ Application Tips

User solutions:
1, use HTTP connection login Gmail;
2, HTTPS, click IE (6.0) browser at the top of the tool menu, options → advanced, cancel the "Do not save encrypted pages" Item check state, restart the computer.
Google should be in Gmail for users to use HTTPS connection login to check, if the use of HTTPS login, do not eject the error prompts, after all, each login appears red error prompts always unpleasant, in addition, IE is the use of the largest browser.

Official solution:
Clear Cache
The information stored by the browser is sometimes incomplete or corrupted. Deleting a browser's cache or cookies usually fixes a Gmail problem.
For instructions, select your browser from the following browsers:

Firefox
In the Firefox of the PC:
Exit the Gmail account and close all other open browser windows.
At the top of the browser, click the Tools menu and choose Clear Private data ....
Select the Cookie and Cache check boxes.
Click to clear private information immediately.

In the Mac Firefox:
Exit the Gmail account and close all other open browser windows.
Click on the Firefox menu at the top of the browser and choose preferences ...
Select a privacy label.
At the bottom of the dialog box, click Clear immediately ....
In the New dialog box, select the box next to the cache and cookies.
Click to clear private information immediately.
Internet Explorer

In Internet Explorer 6.x:
Exit the Gmail account. Closes all other open browser windows.
Click the Tools menu at the top of the browser and choose Internet Options.
Tap the General tab at the top of the dialog box.
Click the Delete file under the temporary Internet file ....
Select the box next to all offline content.
Click OK.

In Internet Explorer 7:
Exit the Gmail account and close all other open browser windows.
Click Tools > Internet Options.
Select the General tab.
Click Browse history to delete.
Click the Delete file under the temporary Internet file.
Click Delete Cookie.
Click OK.
Mozilla

In Mozilla:
Exit the Gmail account. Closes all other open browser windows.
Click the Edit menu at the top of the browser and choose preferences.
Click the + sign next to advanced.
Click on the cache below advanced.
Click to clear the cache.
Click OK.
Netscape

In Netscape:
Exit the Gmail account. Closes all other open browser windows.
Click the Edit menu at the top of the browser and choose preferences.
Click the + sign next to advanced.
Click on the cache below advanced.
Click to clear the cache.
Click OK.
Safari

In Safari:
Exit the Gmail account. Closes all other open browser windows.
Open the Safari menu in the browser toolbar.
Select Empty Cache.
In the dialog box, click Empty.
Other browsers

I'm sorry, Gmail doesn't provide full support for other browsers, and other browsers may not be compatible with some Gmail features.
In some cases, you may need to clear the cache more than once.