unable to deploy from public catalog,

Hi Folks,

we are using vCloud Director 5.5 in a vSphere 5.5 environment.

After Upgrading the complete Stack from 5.1 to 5.5 we've noticed that we aren't able to deploy a vApp from any public catalog.

After selecting the vApp and clicking next to get to the next screen, the proces is "killed" and vcloud director does a sort of relogin.

vApps in the organisational catalog can be deployed.

Any ideas?

regards

Jean