Servers have been updated to cPanel 11.50. The old x3 theme will no longer be support in a shortly by cPanel so you will eventually need to update to the new Paper Lantern theme.
Once you do you will need to upload and new logo for the theme since the WebzPro logo is the themes default.
To do so log in to WHM, change your default package theme to paper_lantern.
Next in WHM go to Home-cPanel-Branding and upload a new logo. You may use the default logo below or create your own.
Logo must be a .png and no bigger than 250x250.