@MoAlyousef Your test program misses to set a font. This results in undefined behavior.
Please add something like fl_font(FL_HELVETICA, 16); before your fl_draw() call. This should fix the issue (it does for me).

Is this a specific issue of the test program (missing fl_font()), or is this the case in the original program?

That said:

1. I wonder why it works with string sizes other than 1 (maybe because of 1-byte-string (width) caching?)
2. for me the original test program crashes with or w/o using Pango (using Xft)
3. I wonder why the crash dump shows the file src/drivers/Xlib/Fl_Xlib_Graphics_Driver_font_xft.cxx whose name indicates that it should be used with xft (and not with Pango?). I could check this myself but I'm currently busy with other stuff, sorry.

Points 1 and 3 may be something for @ManoloFLTK. Manolo?

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