Gazebo simulation with a camera : it says it's incompatible with that RT

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Last week (last friday), my mobile robot model was running perfectly in gazebo. I was abble to display the images of my camera in RVIZ or with a HTML page with mjpeg_server. But today, with the same model, I can't get not displayanything.

I get the following message :

gzserver: /build/ogre-1.9-mqY1wq/ogre-1.9-1.9.0+dfsg1/OgreMain/src/OgreRenderSystem.cpp:546: virtual void Ogre::RenderSystem::setDepthBufferFor(Ogre::RenderTarget*): Assertion `bAttached && "A new DepthBuffer for a RenderTarget was created, but after creation" "it says it's incompatible with that RT"' failed.

I saw 2 topics that may be related to my problem. A fsaa parameter is mentioned...

Can a Gazebo evolution of those last 7 days explain my recent problem ?