Pure OpenGL program also behaves the same
I confirmed that it is not QT by building an
example program from a book
"OpenGL A primer" by E.Angel.
It is a rotating textured cube program with
mouse interaction. When it is rotating,
your mouse cursor on the cube is flickering.
If you stop spinning, I see a square.
I attached zipped file with Makefile
and C code for RedHat 9.
They accept only zip and thus you have to
use unzip to open.