IT may be just a problem I am experiencing, but when using the downloads from the Theming tutorial(s) I experience problems deploying. The reference to the Mendix css seems to be incorrect ?? Using mxclientsystem/mxui/ui/mxui.css instead seems to have fixed the issue for me. Did I do this correctly ?? Edit: It seems that the tutorial is still referring to the 2.something environment. Which would at least partly explain the issues as I used the download from the tutorial as my start-off point... The download in the appstore https://appstore.mendix.com/index.html#1333974402670_264 confused me because that states a dependency on the 2.5 environment ?