Spark 2.5.6 successfully logged in but all windows were blank after login (contact popups displayed though(?))
Identified this as a problem with Java (1.6) with Compiz-Fusion +AIGLX (My platform is Ubuntu Feisty 7.0.4).
Problem sorted after much googl’ing thus thanks to:
"Those who use Java™, to run
applications such as Eclipse and Netbeans will usually find it will
load with no interface present when combined with Beryl or Compiz. You
can fix this by doing the following, I found it works for Java 5 and
Open the environment file in the etc directory. To do this just open a terminal and type the following:-
gksudo gedit /etc/environment
Now the file is open add the line below the path line then save and exit:-
More information regarding this issue can be found at the Beryl site."