Your username here MUST MATCH your XenForo username (connected to your XF license).

    Once you have registered here, then you need to start a conversation at xenforo.com w/Bob and provide the following:
    1. Your XenForo License Validation Token
    2. The Domain Name associated with the License
    NOTE: Your account will be validated once ALL requirements are verified/met. Thank you for your patience.

Icon missing on Admin Panel in XF 2.1

That is expected. Showcase 3.0 is NOT XF 2.1 ready, so things like menus in XF2.1 that are expecting FA 5 ICONS will be empty when a FA 4.3 ICON is being used. This applies to ALL XF2 addons that are using FA 4.3 ICONs (which is what is required for XF 2.0).

Showcase 3.1 will be XF 2.1 compatible.
btw, you can edit the Admin Navigation and add your OWN Icon until I release an XF 2.1 compatible version of Showcase.