Hey X2Go dev community, 
First of all thanks to support this kind of cool product. 
I'm also developer, who is currently developing DaaS (Desktop as a Service) . For my product I'm using X2Go for remote desktop control. But having issues on Mac and some Win clients.  Here is some descriptions:  
 
I'm using this command to open client with just clicking one button: 

x2goclient --session-conf=%configuration_file% --session-id=%some_id% --hide --no-menu --debug --thinclient
 
and OS X specific log, which could be the reason of crashes: 
 
x2goclient[7769:295207] modalSession has been exited prematurely - check for a reentrant call to endModalSession:

If you need any other information, I can provide. 

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Yours sincerely, Zubaidullo Niimatullo uulu