Stefan - thanks for the Title menu settings as that is what it took for me to create the problem.
Andrea - thanks for confirming it so I knew I was not going crazy.

> Did I miss something else? I am using a laptop with a smaller screen that
> is about 16 inches diagonally.
...
Attached is my dialog and rendering (200%)

OK, change the Size in the Title menu to 124 or 126     but not 125, not 123, ...  you get the idea that it should be divisible by 2.
Hopefully, that works for you too as it did for me.

I think the problem is division where the remainder is dropped because you just can not have 1/2 of a pixel from Cinelerra.  There is probably a better explanation of something about 4 spaces for pixels but it is beyond me.  Not sure if for some fonts, changing the code to not drop the remainder is a good idea assuming that is the real problem -- what do you think Andrew R ????

The SchoolschriftLG font does not even appear in the drop down list, while it is available for Inkscape.
 
It is possible that the Inkscape font library is local to Inkscape and not in a system place that Cinelerra sees.  You can easily add fonts to CinGG by copying the ttf file, schoolschriftlg.ttf, to {where Cinelerra is|/bin/plugins/fonts and then run "ttmkfdir" in that directory which creates a new fonts.scale file that includes schoolschriftlg.ttf.  But, of course when you download a new version of Cinelerra, it will be gone.  So I think you can probably add schoolschriftlg.ttf to /usr/lib/"something wherever all other accessible fonts are".