Have you modified the renderCsm_frag, or renderCsm_vert, in anyway? Here are the default files just in case Shaders - Place this in your blockland folder, and replace the two files.
no, I haven't replaced them.
Make sure your graphics drivers are the latest available from the manufacturer's website.
I have the latest. As I said, I could run them earlier with this driver, but suddently, I can't anymore