Fixed it. Your comment that no GL data was available led me to think about a problem I had with MESA about 3 or 4 months ago. As a result I had to replace the running MESA with another version which had been provided I believe by the admin here. Everytime I updated my system Pacman would warn about the version of MESA I had locked to not upgrade, So I unlocked it, upgraded MESA and problem solved. This was the MESA problem back in May :