While I don't have AutoGet, the results you are describing sounds like the associated picture/icon file is missing or is in a format that mIRC isn't recognizing.
Please note that 6.21 is very old (released Nov. 23, 2006).
The latest version is 7.1, though some people prefer to still use 6.35, mainly due to the problems encountered with servers still using codepages rather than unicode.
You're going to have to look through the script to see where the icon files are referenced, and then confirm that the files do exist in that location (or those locations if more than one).
