CATools3/SETMAXCOL() in a DOS windows

When using SETMAXCOL() from CATools3 in Clipper 5.2e with a value greater of
79 in a DOS window, subsequent outputs with @...SAY are not displayed in the
desired row & column, resulting in a messed up video output...

Instead, when the DOS window is in full screen mode everything is magically
displayed in the right position.

And when the DOS window is put back in normal mode, of course, everything
is messed up again....

I already tried to add a VIDEOINIT() and SETMODE().
No changes.

I tried also to change the WIDTH in the Layout tab of the DOS windows
properties
according to the parameter of SETMAXCOL().
Doesn't matters. The window is resized to 80 when Clipper app starts.

Does anybody have the same problem? And, maybe, a solution for having the
"virtual screen" feature of CATools3 working in a DOS window?

Thanx.
Fred