OPC no tags

I try to connct to a Unitronics OPC server at the localhost. The server is in the server list but as I activate the Browse tag button nothung happens. I use ScadaBR 1.0 on a windows 7 PC with java JRE 1.7. With a matrilkon server I can browse the tags. In the Matrikon explorer I can see the unitronics items as well as all the other servers which have the same problem as the UniOPC.

Can anybody help me?