Try changing the start point on the offending glyphs.

André

Thanks, how do you do that?

Control-click on a node and choose 'make node first'.

André

No luck, that didn't solve it. Thanks anyway.

Any open contours?

This font has many repeating shapes, it looks like the CFF Sub-Routinization is ‘eating up’ some of your glyphs.

In the preferences, switch off the option ‘Use subroutines to compress outlines in the CFF table’, found at
‘Generating OpenType and TrueType’ → ‘OpenType PS (.otf)’

@Cristobal, Thanks for your suggestion. I had checked that already, along with clearing the Font Cache, correct connection, optimizing and reloading in the original glyphs.

@frankrolf. Wow,very technical. I have just tried that saving the font as a .ttf and .otf but still no joy.

May be I should let you guys download it, to see if you can find the problem.

Are the characters only missing in the Quick Look preview? I've come across a couple of fonts where the 'X' was missing in Quick Look— both were all-caps fonts with double-encoded glyphs and extended Latin characters. They otherwise functioned normally, and running fontQA reported no other obvious issues. I figure it must have had something to do with the encoding (re-encoding seemed to fix it), but no clue whether it's just a glitch with Quick Look or indicative of a real issue within the font. Although I've never seen a missing 'o' and your font obviously isn't single-case, it might be worth trying Reencode Glyphs or Generate Unicode from the Glyph menu > Glyph Names.

@Gargoyle The characters are only missing in the Quick Look preview. They function normally otherwise. I think it looks unprofessional to send out a font that has a visual error on it.

I just tried the ReEncode / Generat Unicode. No change. :-(

Did you try loading the font on a different computer?

Nippa sent me the font for examination. Here are my solutions to his issues:

The QuickLook glitch was caused by the following:
No glyph names in the font (only uniXXXX).
Solved via: Glyph → Glyph Names → Generate Names …

The missing ‘ABC’ preview in FontBook was caused by a custom preview string stored in the table.
(‘Zephyrs …’)
FL is not able to remove that reliably, buy you can remove the string in a TTX-dump and re-compile the font.

You are a Genius. Huge Thanks.

Glyph > Glyph Names > Generate Names > What mapping file do I choose from the pull down menu, Standard Table or other?
Also which boxes do I need to check?
[ ] Use this table as default
[ ] Try to keep existing glyph names
[ ] Apply only to selected glyphs

Sorry to ask, but :-
How did you remove a string in a TTX-dump, then re-compile?
Could you possibly tell me the step by step process.

The default options in Generate Names worked for me.

I posted my solution for the sample text issue in the other thread.

@gargoyle HUGE thanks.
I didn't think both you and frankrolf would be able to solve both problems at the same time.
Hence why I sent it to the two of you.
Your solutions are brilliant and succinct.
I can now sleep easy, and finally get back to some serious design work.

Today is a very good day. :-)

TTX is a command line utility, part of ‘FontTools’ by Just van Rossum.
I believe it is gets installed with Robofab.

To decompile a font to XML, you just have to do the following:
('fontfile.ttf' being a placeholder for any otf or ttf font):

ttx fontfile.ttf

A 'fontfile.ttx' file will be generated alongside the original font file.
This file can be edited with a text editor.

To recompile the font, simply do:

ttx fontfile.ttx

You will end up with an exact copy of your original font file, plus/minus the modifications you made in the TTX file.

I said: “The missing ‘ABC’ preview in FontBook was caused by a custom preview string stored in the table.”
I meant to say: “The missing ‘ABC’ preview in FontBook was caused by a custom preview string stored in the 'name' table.”

Typophile seems to remove pointy brackets.

Ya mean angle brackets (less-than/greater-than)? Typophile probably thinks, then, that they are disallowed HTML tags. Try using < and > instead.