Holger,
You’re right, it must exist a difference somewhere, but I did not find it.
Last week I’ve updated all environments with the same versions, so the MWSs have all the same :
Version: 9.8.0.4.196
Build Date: 2016-05-21
Correctifs installes : SBPPortal_9.8.0_Fix4,SBPRuntime_9.8.0_Fix4
Regards
Cedric