RDP 8.5 Decoration Calculation problem

Hi list,

After installation of RDP 8.5 I went to install other plugins, in this case
I started with the JasperStudio plugin.
After plugin installation I reopened the workspace and when I open the
iProjects perspective I'm geting a "Decoration Calculation has encounterd a
problem" error message.
The errorlog contains the following.

!ENTRY org.eclipse.core.jobs 4 2 2012-06-16 12:09:47.748
!MESSAGE An internal error occurred during: "Decoration Calculation".
!STACK 0
java.lang.NullPointerException
at
com.ibm.etools.iseries.perspective.model.AbstractISeriesResource.testAttribute(Unknown
Source)
at
org.eclipse.ui.internal.ActionExpression$ObjectStateExpression.preciselyMatches(Unknown
Source)
at
org.eclipse.ui.internal.ActionExpression$ObjectStateExpression.isEnabledFor(Unknown
Source)
at
org.eclipse.ui.internal.ActionExpression$SingleExpression.isEnabledFor(Unknown
Source)
at org.eclipse.ui.internal.ActionExpression.isEnabledFor(Unknown Source)
at
org.eclipse.ui.internal.decorators.DecoratorDefinition.isEnabledFor(Unknown
Source)
at