The bug is there on intel hd 4400 and also the average fps has dropped from 25 to an average of 8, the game is now unplayable on these cards.
You can try to disable the logarithmic depth buffer, this will give some extra fps
To do that, go to your game directory, open the "config.properties" file with a texteditor, and set graphic_logarithmic_depth_buffer to false. Then save the file, and run the game again
Well I wouldn't know either, maybe something inside some new line of code is conflicting with something within the drivers code...(I know nothing about programming unfortunately, so I can only guess and hope it can give any sort of idea or something in the process)
Well, actually the old Intel drivers as well as the old AMD drivers (which are mainly based on the ATI drivers) are a mess when it comes to OpenGL
The old Intel drivers didn't even support some basic OpenGL features (some features they have to support according to the specification), but AMD/ATI also had trouble with certain features...
But since this issue also occurs with newer Intel drivers apparently, we will try to find a workaround for this issue (once the upcoming hotfix is ready) 