Hi Stefan,

I was able to understand how to use the publush application mode,
So I opened "Pycharm" using the application finder. And the problem exists there too.
By the way the problem I am facing seems to me similar to that reported here:
https://bugs.x2go.org/cgi-bin/bugreport.cgi?bug=1369
When I reducing the connection to ISDN helped, but the rendering of the desktop became very slow and not usable.

About the log, this is the text that was printed into the command promt:
x2go-INFO-1> "Starting X2Go Client 4.1.2.2..."
x2go-WARNING-1> English language requested, not loading translator.
x2go-WARNING-1> English language requested, not loading translator.
x2go-DEBUG-../src/onmainwindow.cpp:10779> Getting X.Org Server settings.
x2go-INFO-3> "Started X2Go Client."
x2go-DEBUG-../src/onmainwindow.cpp:575> "$HOME=C:/Users/teiny171950"
x2go-DEBUG-../src/onmainwindow.cpp:2266> Reading 1 sessions from config file.
x2go-DEBUG-../src/sessionbutton.cpp:361> Creating QPixmap with session icon: ":/img/icons/128x128/x2gosession.png".
x2go-DEBUG-../src/onmainwindow.cpp:13290> libssh not initialized yet. Initializing.
x2go-DEBUG-../src/pulsemanager.cpp:369> pulseaudio --version returned:"pulseaudio 13.0
"

x2go-DEBUG-../src/onmainwindow.cpp:10682> Starting helper servers for Windows ...
x2go-DEBUG-../src/onmainwindow.cpp:10849> "/cygdrive/C/Users/teiny171950/.x2go/var" cygwin var path
x2go-DEBUG-../src/onmainwindow.cpp:10937> "C:/Users/teiny171950/.x2go/etc/sshd_config created."
x2go-DEBUG-../src/onmainwindow.cpp:10344> Resolved localhost.
x2go-DEBUG-../src/onmainwindow.cpp:10366> Port is free: 7022
x2go-DEBUG-../src/onmainwindow.cpp:11288> Logging cygwin sshd to: "C:/Users/teiny171950/.x2go/sshLogs/p26656.log"
x2go-DEBUG-../src/onmainwindow.cpp:11302> Creating desktop: x2go_TEiny171950
x2go-DEBUG-../src/onmainwindow.cpp:10344> Resolved localhost.
x2go-DEBUG-../src/onmainwindow.cpp:10372> Port already in use: 7022
x2go-DEBUG-../src/onmainwindow.cpp:10344> Resolved localhost.
x2go-DEBUG-../src/onmainwindow.cpp:10372> Port already in use: 7022
x2go-DEBUG-../src/onmainwindow.cpp:11399> User mode OpenSSH server started successfully.
x2go-DEBUG-../src/pulsemanager.cpp:227> pulse started with arguments ("--exit-idle-time=-1", "-n", "-F", "C:\Users\teiny171950\.x2go\pulse\config.pa", "-p", "C:\Program Files (x86)\x2goclient\pulse\lib\pulse-13.0\modules", "--log-level=debug", "--verbose", "--log-target=file:C:\Users\teiny171950\.x2go\pulse\pulse.log") - waiting for it to finish...
x2go-DEBUG-../src/onmainwindow.cpp:2752> Creating QPixmap with session icon: '":/img/icons/128x128/x2gosession.png"'.
x2go-INFO-8> "Starting connection to server: dcilda927:22"
x2go-DEBUG-../src/onmainwindow.cpp:2853> Starting new ssh connection to server:"dcilda927":"22" krbLogin: false
x2go-DEBUG-../src/sshmasterconnection.cpp:168> SshMasterConnection, host "dcilda927"; port 22; user "e171950"; useproxy false; proxyserver ""; proxyport 22
x2go-DEBUG-../src/sshmasterconnection.cpp:248> Starting SSH connection without Kerberos authentication.
x2go-DEBUG-../src/sshmasterconnection.cpp:250> SshMasterConnection, instance SshMasterConnection(0x3d18258)  created.
x2go-DEBUG-../src/sshmasterconnection.cpp:495> SshMasterConnection, instance SshMasterConnection(0x3d18258)  entering thread.
x2go-DEBUG-../src/sshmasterconnection.cpp:575> Setting SSH directory to C:/Users/teiny171950/ssh
x2go-DEBUG-../src/sshmasterconnection.cpp:797> Session port before config file parse: 22
x2go-DEBUG-../src/sshmasterconnection.cpp:807> Session port after config file parse: 22

About the file x2godebug.log, it is empty (0kb)

Thanks a lot,