Still goes into infinite recursion with build 66895 (I'm guessing - can't get a trace but it
keeps using more and more memory.  Killed it when it got to 500 MB).
Here is a sequence that always reproduces the problem for me on Solaris 10 x64,
using JDS.  Contents of .gtkrc-2.0 file is
gtk-font-name="Arial 18"
Display is 1280 by 1024.
You might have to mimic this setup exactly to see the problem, or it may just
require setting font and display size to match the above.

Delete ~/.es directory.
Create basic (nongraphical) application.
Click on "X" for Features window to close it.
Click on "X"' for Clusters window to close it.
Undock Output tool and put it in left half of window across bottom of
   main tool.
Undock Diagram and put in left half of Output window.
Undock class and put in left half of Diagram.
Undock Feature Relation and put in left half of Class.
Undock Dependency and put in left half of Feature Relation.
Undock Metrics and put in left half of Dependency.
Undock External Output and put in left half of Metrics.
Estudio goes into loop eating more and more CPU and memory.
   I killed it when memory usage got to 600 MB and over 4 minutes of CPU time.