Totem has problems with AMD cards (clutter does not support HDR colors /rgb10/)
When you try to run Gnome Maps on a computer using an AMD graphic card, the application starts but is unable to create a main window. The problem was discussed in this bug here https://bugzilla.redhat.com/show_bug.cgi?id=1560481, where you can find more info.
To highlight at least some if the findings. It has been identified, that the AMD cards now support HDR colours (rgb10) which causes some application to behave in a weird way. The problem has been located to clutter (Comment 26 of the RHBZ) and a temporary solution was proposed in Comment 33 detto. The solution worked and the support could be switched off. After that, Totem is working without issues.
In one of the meetings, Matthias Clasen stated: "... the only clutter we care about is the one inside mutter. Anything else using clutter is living on borrowed time."
However, we would like to support these features (HDR colours) in Fedora 29 and applications, such as Maps, should be ready for this step.