I have also problems with this latest GTK+2.0_2.23.3-1ubuntu2.
GDM works fine, but certain applets became invisible:
- clock
- notification area
- trash.
Downgrading GTK+2.0 to version 2.23.2-0ubuntu4 did fix this.
I did not have to downgrade the new GTK+3.0 packages.
I have also problems with this latest GTK+2.0_ 2.23.3- 1ubuntu2.
GDM works fine, but certain applets became invisible:
- clock
- notification area
- trash.
Downgrading GTK+2.0 to version 2.23.2-0ubuntu4 did fix this.
I did not have to downgrade the new GTK+3.0 packages.
See bug #693758