Add ABAP program: validating package - error accessing shared objects-area

When adding a new program or browsing the packages in eclipse i get an "error accessing shared objects-area".

I can edit, save and run existing ABAP reports, however.

There was a similar problem here, regarding database procedure proxies but the solution doesn't apply to my problem, i guess. The solution was about creating the shared memory area CL_RIS_SHM_AREA. I can't access the memory area and start the constructor, as it doesn't show up on the monitor.

ADT 2.28

Eclipse 4.3

Netweaver 7.31 SP4 -> is this really compatible with ADT 2.28?

Thanks in advance for helpful hints,

Julian