ZK - Open Source Ajax Java Framework

When I try to install ZK Studio (in Eclipse Helion) form the Marketplace the installation get stuck at:
http://img6.imagebanana.com/img/vhse4mkc/zkhung.PNG

If I try to install using the eclipse update I get:
An error occurred while collecting items to be installed
session context was:(profile=epp.package.jee, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=).
Comparison method violates its general contract!
Comparison method violates its general contract!

I try now the offline installation :/

Ok I have tried the manual installation now and get:
An error occurred while collecting items to be installed
session context was:(profile=epp.package.jee, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=).
Comparison method violates its general contract!
Comparison method violates its general contract!

Hi daslicht,
What version of eclipse do you use? and OS?

same issue here.. using eclipse 3.6 under windows 7 64Bit.

I have finally managed to install it under Helios!

But I am not able to drag and drop or select components to the visual editor ?
The visuel editor looks like if its actually running the code, so I can press buttons etc..

How do I put it in edit mode so that I can select components ?

The Dicumentation says:
"When you select a certain component within the ZUL Editor, the component inside the ZUL Visual Editor is highlighted with a blue dash-line rectangle frame,"

That did not happen here ?

Hi daslicht
The VE is not allow click and drag,
about the highlighted feature, ZK 5 project have not support yet.

@ daslicht
how do you manged install under Helios? can you tell me, please.
I have the same problem.
Thank you