ImageGlass prints by using the 'print' command, having created a file in the temp directory.
A more reasonable test would be to attempt to print from Windows Paint, rather than Office. Or better yet,
attempt to replicate what IG is doing: on a user system, open a Command Prompt window, then use the
'PRINT' command to print an image.
If both of those work, then I'll have to dig more into the details.
Kevin