the dedicated "marker" button on the VS-700 does not create a marker any more (while keyboard shortcut "M" still works) ... apparently the MIDI message which the button triggers is no longer mapped properly to adding a new marker in Sonar ...
I could work around by adding a MIDI translator to link the VS-700 MIDI message to the keyboard shortcut "M" ... however, this only works when Sonar is the application which got the focus ... so I'd much appreciate this being fixed again soon