On Fri, Jul 22, 2016 at 05:58:44PM +0200, Alexander Voigt wrote:
IMHO, this is somehow related to the default fonts set in dillorc or the global set system fonts.
+1
A wild shot, but a cheap one, so I'd also try that first. Change your default font to something else and see what happens.
Also check FLTK's test programs (IIRC there's a symbols one, and another that's useful to try fonts).
If FLTK also has problems check the video driver (older kernel, older/different video driver, GRUB CLI parameter).
I have not set any specific font in dillorc, so the default setting is used. However, when I change the monospace font to
font_monospace="Monospace"
then the rendering problem disappears and the underscores are correctly displayed. When I change to
font_monospace="DejaVu Sans Mono"
the rendering problem is present, i.e. the underscores are not displayed.
I've tried all of them here and they work. Devuan Jessie, amd64, Linux 4.5.0-2-amd64 (fltk-1.3.1). ------ Is that the only symbol that disappears? Try a line like: !"#$%&/()=?¡-_{}^[]~.,;:|° and check whether those are displayed. -- Cheers Jorge.-