Internet Explorer: IE8, IE9, IE10, and IE11 Compatibility mode

This mode tells your browser to treat web sites as if it was using IE7 or another version of IE.

In IE9, access the menu via the Gear icon and select F12 Developer Tools or press F12 on your keyboard
In the bottom window of your web browser a new row will appear starting with "File"
Click on Browser Mode and change it to IE9
Click on Document Mode and change it to IE9 standards
Once changed, access Claro again and attempt to log in. You may close the developer Tools bar

In IE10, access the menu by pressing the ALT key to bring up the top menu and the go to Tools > Developer Tools, or press F12 on your keyboard
In the bottom window of your web browser a new row will appear starting with "File"
Click on Browser Mode and change it to IE10 (NOT the IE 10 Compatibility View)
Click on Document Mode and change it to IE10 standards
Once changed, access Claro again and attempt to log in. You may close the developer Tools bar

In IE11, access the menu by pressing the ALT key to bring up the top menu and the go to Tools > Developer Tools, or press F12 on your keyboard
In the bottom window of your web browser a new section will appear starting with F12 display
Scroll down to locate the Emulation mode (icon with desktop screen and mobile screen)
Set document mode to Edge (Default)
Set User agent string to Default
Note: you may wish to set the document mode and user agent string to IE10 as not all Claro features have been fully tested with IE11.

In some cases your browser may be set to always try to use compatibility mode.