https://bugs.freedesktop.org/show_bug.cgi?id=100393
--- Comment #7 from Mika mikael.public@gmail.com --- Hi, With compat, in earlier version (1.7.4) I had GLSL compilation issues so in few application the transform_feedback didn't work. It was related to GL_ARB_enhanced_layouts, something was telling me it was not usable within a vertex shader.
In latest version with compat I had a completly garbled display, there was a problem when resolving function pointers for GL_ARB_direct_state_access, mainly glBindTextureUnit, if I remember correctly.
The only way I found was to start with a core profile, and address issues one by one.