Ctrl+Space auto completion is not working on Business Client 7.70 with SAP NetWeaver 7.3 system

Hi!

Ctrl+Space auto completion is not working in ABAP editor on Business Client 7.70 with SAP NetWeaver 7.3 system. Auto completion popup window appears for a split second and disappears, immediately after which the focus is placed to the 'Menu' button.

In the same time Ctrl+Space on SAP NetWeaver 7.5 systems works without errors on Business Client 7.70.

Also Ctrl+Space works without errors on Business Client 7.0 + SAP NetWeaver 7.3.