Glyphicons Hamburger is not showing after upgrade 3.1

[almostwo]

Hello,

When i finish the upgrade everything work great, the only problem I have its the new "hamburger" icon from bootstramp it's not working, in Chrome i get a blank space and in IE and Firefox i get just a square.

[yuri]

Could be a cache.

[almostwo]

I will try making the update and check with a different computer.