Hello Peter,
If you execute the transaction SICF_SESSIONS - what information does it show you?
If you test the Z service with only the following GUI Configurations parameters:
~THEME 99
~TRANSACTION LM01
~ITSMOBILE 1
~SOURCES Zxxxxx, itsmobile, itsmobile01, system
what is the result of selecting the "Logoff Button" icon?
Regards,
Oisin