If you use CAPTCHA on your BlueDragon 6.2 based install of BlogCFC, you will probably have an issue with the LylaCaptcha code. The fix is detailed here:
I modified captchaService.cfc at around line 265 to read:
<cfset aCharacter = CreateObject("Java","java.lang.Character")>
<cfset left = left + ((RandRange(150, 200) / 100) * graphics.getFontMetrics().charWidth(JavaCast("int",aCharacter.getNumericValue(char)))) />
CF7 seems to handle the different methods for getFontMetrics().charWidth() but BlueDragon 6.2 can't without some help.
UPDATE: added BD version info; this bug should be fixed in BD 7.0.