Really curious, there's no reason that restore had caused this problem. It's probably other thing.
Try to create a new profile, and look if the problem is gone.
If it is ok, close K-Meleon and just take the files you want to keep in your old profile and put it in your new profile folder (bookmarks.html, mimetypes.rdf, ...)
A+
Mozilla/5.0 (x11; U; Linux x86_64; fr-FR; rv:38.0) Gecko/20100101 Ubuntu/12.04 K-Meleon/76.0
Web:
http://jujuland.pagesperso-orange.fr/
Mail : alain [dot] aupeix [at] wanadoo [dot] fr
Ubuntu 12.04 - Gramps 3.4.9 - Harbour 3.2.0 - Hwgui 2.20-3 - K-Meleon 76.0 rc