Multiclients (r5 en r6) and preview in webbrowser troubles

Hi,

I installed both r5 and r6 domino designer clients on a machine.

r5 is installed on lotus\notes and lotus\notes\data

r6 is installed on lotus\notes6 and lotus\notes6\data

when i want to preview a new database on the r5 installation this goes OK

when i want to preview a new database on the r6 installation this goes OK

when i want to preview again the database under the r5 client this is not possible

seems there is a conflict with the local host :-?

can anyone tell me how i can manage that i both can do preview in a webbrowser from both clients?