I had a problem. It was a small search effort, but I could solve it without creating a new project etc...
The thing was I had a Class B that was importing Class A.
Then I had a class that imported Class B and also Class A.
When I did this, these problems occured.
Eg. A SOAP webservice Class imports all the Entities that are passed over the web.
Then I had a Singleton class used for caching that had the Logged in Person and also a ref to the webservice class.
--> this is where is went wrong!!
So watch out for these circular references. ITs not so easy to detect them!