gnome session errors question

[Linda]

I am using gnome flashback/metactiy and it is taking a while 
to start the desktop session. When I checked the syslog it 
shows warnings
Dec  4 07:57:28 venus gnome-session[2399]: WARNING: Could 
not parse desktop file deja-dup-monitor.desktop or it 
references a not found TryExec binary
Dec  4 07:57:30 venus gnome-session[2399]: WARNING: Could 
not parse desktop file vino-server.desktop or it references 
a not found TryExec binary
Dec  4 07:57:30 venus gnome-session[2399]: WARNING: Could 
not parse desktop file gwibber.desktop or it references a 
not found TryExec binary
I have removed all of these programs with synaptic as I do 
not use these programs. Is there a way to tell gnome not to 
try and find these or to create dummy files incase this is  
part of what is slowing down the start of the session
             Thanks
                Linda