As it seems that I've been hit by the bug #693758 I am willing to downgrade gtk+.2.0 from 2.23.3 to 2.23.2. But it seems that I have no package with such a name in my system :-( how do I downgrade it then?
In this particular case for 32-bit:
or for 64-bit
If the previous version is still available from the repositories you should be able to list it with:
To install a specific version of a package use (on this example the version is 2.22.0-0ubuntu1):
Please note that downgrading packages is not supported, but likely to work without problems in most cases.