Before this problem I updated my drivers to latest ones; because of problem, yesterday and today I tried again a lot of variants: install old drivers from pack with videocard (ASUS EAH5750) over the new, again full cleaning of drivers and install new, full cleaning of drivers and install old drivers from pack etc. Very interesting that I had a lot of problems and with installation of drivers, I mean installer that, I do not why, sometimes displayed errors messages (and not only for me, as said Google). So, now I installed 13.12 version of driver after cleaning (I had to install videodriver separately from its folder, because AMD's installer does not work normally); same problem with 14.4 drivers, latest.
All is okay with image, but in Med the same problem, the same "Unsupported Extension: GL_EXT_PALETTED_TEXTURE". In Internet I cannot search information how to solve it. I will write to AMD and I hope, their support can help me.
Did you tried to view the objects through IPL Tab and click on the objects from the list once LAn.IPL was generated or IDE Tab if not.
When I click on IPL, I see only LOD-variants of models. I think, Med displays LODs because it cannot display normal objects because they have compressed (or "palleted", as written in that error message, I do not, what does it means) textures.
It's "funny" that these problems appeared suddenly... For no apparent reason on my way there are new obstacles.