Issue

After upgrading the application from Studio Pro 9 to 10 and upgrading the Atlas core module to the latest available version for Studio Pro 10, icons, such as the arrows in the control bar for datagrid 1, are missing. 

Environment

Studio Pro v10.0.0 and newer

Cause

The reason for this is because of an incomplete theme/web folder.

Solution / Workaround

• Visit this github link and then download the atlasui-theme-files.zip folder.
• Find the Web folder and copy all of the contents in that folder and move that into the applications /theme/web folder. Please be aware that any custom variable content will be affected by this action, and will need to be adjusted after replacing the folder contents. 

Additional information

• Mendix Documentation: Upgrading from Mendix Studio Pro 9 to 10
• Other documentation: Atlas UI github