Hi Markus
I had the same issue while opening Design Studio 1.4 in 32 bit OS. I thinks its because of the SAP JVM that is built in inside Design studio that causes the problem. Can you please try removing the highlighted lines below in the ini file?
Image may be NSFW.
Clik here to view.
Removing this line will make Design studio access the default Java installed in the system instead of using the one inside Design Studio itself.
Changing parameters like the ones mentioned in this blog helps a lot with stable functioning of the client tool.
Hope this helps.
Regards,
Varshini.