Dave,
Thanx for your explanation.
For all: i've tried a different approach: use multiple sheets and only one view on each sheet.
This doesn't solve my problem, but might have given away a clue: a section view in one direction is messed up with the hatch filling the whole view, a cross section in the perpendicular direction doesn't have that problem. Strange huh?
Also, i've been talking to the support departement of our local reseller and they suggested the solution described in the knowledge base under nr. TS66809, which is to remove the secion line from the base view, draw another one in sketch mode and offset it a little from the original one. This was originally an ACIS kernel bug, but ACIS is no longer in the picture since release 5.3, isn't it?
This didn't solve my problem however...So if any one has any ideas: they're welcome!