Is this a normal behavior [not secifically related to Corona Alpha 5 ] :
1-Open the archicad surface window.
2-Click the text button
3- switch to any type ( checker for instance )
3-click ok
Now all the archicad menu(s) are availble. [ie: the corona Menu, but even if you click on the VBF windows,it will not lunch until you close the surface windows] .
[ The normal procedure is to open the VBF then the surface window.], in that case, the archicad menu should still grey and inaccessible0