Capture all doesn't necessarily fix it. I've had the same problem this time AutoCAD 2011, windows 7 pro.
If you select 'capture some' then 'edit font list' you can 'check all' this makes sure all fonts are embedded.
You may also find that you get another message about not being able to generate font and it might not print correctly. I have found that this is because of the degree or diameter symbol, possibly in the dimension. It seems to be an error with the Arial symbol, if you change the symbol to Times New Roman it works fine.
Be careful though you may have to change the dimension to text to change the symbol only, so it won't update as you change the dim.
according to the image <111111111111111.jpg 248 KB> from syria89 please be careful and try first NOT to check the option "as geometry". It should be enough to capture all fonts. If you convert all text-like objects to graphic the PDF:
@syria89: please understand the not as critic to your post, it's just a tip as I often read and heard the other side asking "my PDF's are so large"
- alfred -