GLSL with latest driver

I have GLSL shaders which compile, link and run fine using NVIDIA Geforce drivers up until 472.12. Program reports back using OpenGL 4.6 and shader version 460. Starting with NVIDIA GeForce driver 497.09 my GLSL shaders no longer compile nor link (they do not accept the OpenGL built in variables for one thing , (i.e. gl_MultiTexCoord0, gl_Vertex etc.). None of the later versions work either up to 511.79. Program still reports back same OpenGL and GLSL versions. I am running a Geforce GTX 950. Any help is appreciated as to what is going on…