@Z22You asked which version I was looking at when I suggested not bothering with the in and out qualifiers. It was not one of you version but it was something in the last post in this thread by EverthangForever which included
in vec4 TexCoord;
out vec4 vTexCoord;
in vec4 FragColor;
out vec4 Colsize;
I have to admit though that I was a little ***** and thought it was something that you had posted, however the advice still stands.
I have just downloaded versions 5 and 6.