I encountered the same problem, characterised by:

1. Warning about fonts in the log.

2. Session resumes briefly but then automatically suspends after about 1 second.

3. Log messages in ~/x2go/*/session.log as follows:

nxagentReconnectFailedFonts: WARNING! Font server tunneling not retrieved. nxagentReconnect: WARNING! Unable to retrieve all the fonts currently in use. Mi ssing fonts have been replaced. nxagentSighupHandler: WARNING! Ignoring the signal in state [SESSION_GOING_UP]. keyboard file created Session: Session resumed at 'Tue Jul 29 17:10:00 2014'. Info: Screen [0] resized to geometry [1920x1200] fullscreen [0]. Session: Suspending session at 'Tue Jul 29 17:10:03 2014'. Info: Waiting the cleanup timeout to complete. Session: Session suspended at 'Tue Jul 29 17:10:03 2014'.

The cause of the problem was indeed that some fonts were missing on the client (a gentoo system). I simply installed all the font packages I could find one at a time until the problem went away.

In my opinion, the x2go client is not capable of running with missing fonts, despite the message indicating that missing fonts will be replaced. I think this may be a bug.

Tested with x2goserver version 4.0.1.15 and x2goclient version 4.0.2.0.