This problem happened to me after installing OpenMW on Fedora 24. The problem was that OpenMW loaded, but all I saw was a pink screen, even though I heard the game music in the background. The diagnosis is that OpenMW is missing some texture compression algorithms.
To fix it, do the following:
$ sudo dnf install libtxc_dxtn
You may also need the following:
$ sudo dnf install OpenSceneGraph-qt-devel