TechnoGate/vimius — comment on commit 83fe7d6f335331138c33795159ca40b93f654e0d
File:  line 0
By adrianrego:

ok, found the problem. i take it we're loading these settings at runtime and that's what causing it. i moved the enable_signs setting to my .vimrc.after file and it worked fine.

See https://github.com/scrooloose/syntastic/issues/23