Gmail password dialog box does not work and also can render the desktop useless after login

After each login a dialog box appears to enter the password of my gmail mailbox. However even if I type the correct password, the dialog box reappears. It seems it's totally unimportant if I type the correct or some incorrect password. The only thing which helps is to cancel the dialog box two times. The more important problem however: the dialog box does not appear immediately after the login, sometimes dozens of seconds pass. If I open some application, terminal, etc, it can cause problems especially if the app is in fullscreen mode: then the dialog box made the desktop unusable, I can't change between windows, I can't type, etc (I have to switch to text console, and stop/start lightdm to cure the problem ... the other workaround is to wait after the login the dialog box to appear cancel it two times and then I can work, but that's a bit hmmm odd). I know the problem is with the dialog box, as I can see "through" the terminal window, since it's set to be somewhat transparent.

It's in this way since upgraded to 13.10 (and now in 14.04 too), one of the main motivation to upgrade to 14.04 was to avoid this very annoying feature. However it seems it's still a problem.

Unfortunately I have no idea which app/setting/etc made the system to ask this password and why the correct password is not accepted :( Only today I got some hint by swithing into text console and digging in the process list. It seems there is a process which onky can be found during this problem: /usr/lib/gcr/gcr-prompter

That's why I send this report against the gcr package as it seems to own that file.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: gcr 3.10.1-1
ProcVersionSignature: Ubuntu 3.13.0-17.37-generic 3.13.6
Uname: Linux 3.13.0-17-generic i686
ApportVersion: 2.13.3-0ubuntu1
Architecture: i386
CurrentDesktop: Unity
Date: Thu Mar 13 20:27:11 2014
InstallationDate: Installed on 2012-03-03 (740 days ago)
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
SourcePackage: gcr
UpgradeStatus: Upgraded to trusty on 2013-10-18 (146 days ago)