I'm not sure if you followed my link, but killing unclutter and stopping it from running at startup fixes this for me.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to thunderbird in Ubuntu. https://bugs.launchpad.net/bugs/1234468 Title: Keystrokes are hijacked by inactive window Status in Mozilla Thunderbird Mail and News: New Status in “thunderbird” package in Ubuntu: Confirmed Bug description: Recently, possibly in the upgrade to Thunderbird 24.0, I've found that the front-most, active window often will not receive keystrokes. Instead they are being sent to the background, inactive window. For example, I attempt to reply to an email, and start typing. I see text in the body as expected, then a second after beginning, the text is sent to the main "mail index" window. The front-most window is shown as selected in the pager, while a non-selected window receives the keystrokes. This means that for long periods, I am unable to send and compose emails. In addition, I'm also often mid-sentence when I realise that the characters aren't appearing, and I've done some weird filing/labelling in the mail index window. I can alt-tab or click between windows, but cannot seem to type into the compose window. Otherwise, clicking does all you expect it to. You can select menus of the window; you can even select text (although it's the "background window" grey instead of the "foreground window" blue). I tried to make sure that it was not an issue with X/KDE by testing to see what the reported active window was. $ xwininfo | grep -i 'window id' xwininfo: Window id: 0x3c001f6 "Inbox - Uni - Mozilla Thunderbird" $ xwininfo | grep -i 'window id' xwininfo: Window id: 0x3c0670c "Write: Re: Foo Bar - Unicode (UTF-8)" $ sleep 1 && xprop -root | grep -E '^_NET_ACTIVE_WINDOW' _NET_ACTIVE_WINDOW(WINDOW): window id # 0x3c001f6 $ sleep 1 && xprop -root | grep -E '^_NET_ACTIVE_WINDOW' _NET_ACTIVE_WINDOW(WINDOW): window id # 0x3c0670c It seems that even when the active window is reported to be the compose window by X, it will still not receive input. I presume that it's Thunderbird hijacking the active window internally. I don't see this in any other application, except for Firefox occasionally. It used to be fairly frequent in Firefox six months ago, but appears to have diminished in frequency since then. Here is a troubleshooting thread for this issue. https://forum.kde.org/viewtopic.php?f=111&t=117704 Here is the related thread for Firefox. http://forum.kde.org/viewtopic.php?f=111&t=110202&p=260008#p260008 ProblemType: Bug DistroRelease: Ubuntu 13.04 Package: thunderbird 1:24.0+build1-0ubuntu0.13.04.1 [modified: usr/share/applications/thunderbird.desktop] Uname: Linux 3.9.4-030904-generic x86_64 AddonCompatCheckDisabled: False ApportVersion: 2.9.2-0ubuntu8.3 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: lee 2493 F.... pulseaudio BuildID: 20130913150408 Channel: Unavailable Date: Thu Oct 3 11:02:13 2013 ForcedLayersAccel: False IfupdownConfig: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback InstallationDate: Installed on 2012-12-16 (290 days ago) InstallationMedia: Kubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.1) IpRoute: default via 192.168.2.1 dev wlan0 proto static 169.254.0.0/16 dev wlan0 scope link metric 1000 192.168.2.0/24 dev wlan0 proto kernel scope link src 192.168.2.2 metric 9 MarkForUpload: True MostRecentCrashID: bp-8716a067-8317-4ad0-808a-2254e2120524 PrefSources: prefs.js [Profile]/extensions/{9533f794-00b4-4354-aa15-c2bbda6989f8}/defaults/preferences/prefs.js /usr/lib/mozilla/extensions/{3550f703-e582-4d05-9a08-453d09bdfdc6}/{847b3a00-7ab1-11d4-8f02-006008948af5}/defaults/preferences/enigmail.js /usr/lib/mozilla/extensions/{3550f703-e582-4d05-9a08-453d09bdfdc6}/{847b3a00-7ab1-11d4-8f02-006008948af5}/defaults/preferences/000system.js [Profile]/extensions/{e2fda1a4-762b-4020-b5ad-a41df1933103}/defaults/preferences/lightning.js Profiles: Profile0 (Default) - LastVersion=24.0/20130913150408 (In use) RelatedPackageVersions: google-talkplugin 4.7.0.0-1 adobe-flashplugin 11.2.202.310-0raring1 kopete 4:4.10.5+dfsg1-0ubuntu0.1 rhythmbox-mozilla 2.98-0ubuntu5 RunningIncompatibleAddons: False SourcePackage: thunderbird SubmittedCrashIDs: bp-8716a067-8317-4ad0-808a-2254e2120524 bp-8c247ae3-5982-4262-b65d-57a252120307 bp-1ab81b2c-1607-4919-868d-380852120205 UpgradeStatus: Upgraded to raring on 2013-04-26 (159 days ago) dmi.bios.date: 09/07/2012 dmi.bios.vendor: Dell Inc. dmi.bios.version: A19 dmi.board.asset.tag: Base Board Asset Tag dmi.board.name: 0XN71K dmi.board.vendor: Dell Inc. dmi.board.version: FAB1 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: 0.1 dmi.modalias: dmi:bvnDellInc.:bvrA19:bd09/07/2012:svnDellInc.:pnDellSystemXPSL702X:pvr:rvnDellInc.:rn0XN71K:rvrFAB1:cvnDellInc.:ct8:cvr0.1: dmi.product.name: Dell System XPS L702X dmi.sys.vendor: Dell Inc. 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