Java WebDynpro Apps don't working in Netweaver 7.4 SP5

We have a great problem since migration from 7.3 to 7.4.
All WebDynpro applications developed in older versions (7.0 and 7.3) work fine, but new ones do not work.
To isolate the problem we writed a simple HelloWorld application and it can be built, deployed and runned sucessfully, but, if our View has any UI control with events (for example, one button to display a sentence when pushed), the action is not fired and nothing happens. Debug in NWDS don't stop at this methods too...
Attach two images of our problem...
Does anyone has an idea to solve the problem?
I apreciate whatever help you can give us...Thank you!!
Óscar Moya

Problem Solved!
Write the solution to help other users with similar Problems.
We followed a SCN recommendation consisting in de-activate all plug-ins on Startup Developer Studio Tool to improve performances. (Window -> Preferences -> General -> Startup & Shutdown) but this is a great mistake!!! because its false that NWDS activate automatically these plug-ins when needed. So debugging, events firing, and other essentially funcionalities were disabled without error logging.
So, the solution is to maintain all plug-ins activated on startup.
Bye!!

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Java WebDynpro Apps don't working in Netweaver 7.4 SP5

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