Developer reply by Aron Rubin
Rated 1 out of 5 stars
I've came to notice that this only happens when I receive attachments whose names have non-ASCII chars like ç and º and á for instance.
This review is for a previous version of the add-on (1.2.2).I am preparing Lookout 1.2.3 now. You will find it at the project site. I have fixed a bug where an extra string terminator was left in a unicode string.
http://lookout.mozdev.org
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