From that error, it looks like User 2 may have EG logging turned on and that it is interfering with scheduling since they do not have permission to create a Windows Event Log appender (perhaps they don't have permission to write to the Windows Event log?).
I recommend having User 2 turn off EG logging if not already. For example, open EG, go to Tools->Options->Application Logging, and uncheck "Enable logging" if checked. If that does not resolve, try renaming the logging.config file in User 2's %appdata%\SAS\EnterpriseGuide\7.1 location (ex. to logging.configBAK). Then have User 2 try to schedule again and see if it resolves.
Casey
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