Composite applicaiton does not load plugin

Hello,

we currently got an issue with our composite application we developed. The composite application we developed contains two content area’s. One header in which we show a simple notes form containing the company logo.

The other frame contains a custom eclipse plugin. One of our employees currently has the issue whenever he wants to open the composite application only the top frame is visible. The other part of the screen is filled with a white.

We tried to clear the cache of the user and so on but this does not work. Does somebody know this issue and is aware of a solution?