If anyone that uses Adblock for Chrome v2.7.3 and has started noticing ugly garbled text in it the reason is because of the font it now uses which is called and named: OpenSans.woff
Simply deleting that font (while your Chrome-based browser is closed of course) will completely get rid of the ugly garbled text. After it's gone and when you then look into Adblock settings, etc., it will now use a Windows font.
The font is located in the Extensions folder in your Chrome-based browser, it's like this for Comodo Dragon:
Your User Profile\Local Settings\Application Data\COMODO\Dragon\User Data\Default\Extensions\gighmmpiobklfepjocnamgkkbiglidom\2.7.3_0\font