I can confirm this as well.
Environment: Ubuntu 10.04.4 x86_64 (gnome 2.30.2) Thunderbird: 17.0.5
"Bad key or directory name: "/desktop/gnome/url-handlers/GMT+01/command": `+' is an invalid character in key/directory names"
I can confirm this as well.
Environment: Ubuntu 10.04.4 x86_64 (gnome 2.30.2)
Thunderbird: 17.0.5
"Bad key or directory name: "/desktop/ gnome/url- handlers/ GMT+01/ command" : `+' is an invalid character in key/directory names"