https://bugs.freedesktop.org/show_bug.cgi?id=43096
--- Comment #6 from Tom Stellard tstellar@gmail.com 2011-11-20 09:54:59 PST --- (In reply to comment #4)
This fixes the error, but the leader portraits still aren't being rendered, so I guess there is some other problem causing this. I'll have to bisect to find out exactly what it is. This bug can be closed once the above fix or something equivalent is committed to mater.
I found the real problem, shaders are being failed for having too many varyings / uniforms (Bug 42930 and Bug 43121). When those shaders compile successfully, the portraits are rendered, and I don't get the "refusing to render" error.