Why do some fonts display AbCdEfGhIj as Preview Text?
Initially MainType shows a different preview text (AbCdEfGhIj) for Symbol fonts. You can change this behavior through the Options window (Select Options from the Tools menu and then click the Preview Text tab). At the bottom of this page you can change the preview text used for Symbol fonts. Alternatively you can disable this feature through the “Show this text for Symbol fonts” option.
Symbol fonts are special fonts, that should only include symbols, signs, signatures, pictures, decorations, arrows and bullets. Symbol fonts do not form words so line breaks can occur after any character code. Most spell checkers don’t check symbol font-formatted content.
There are Symbol fonts on the market that contain (Latin) characters. Such fonts do cause problems as explained above (e.g. wrong line breaks and no spell checking). In such case you should contact the font vendor.