Criticial bug for the OLEGuids.tlb.
The recent modification - few hours ago - included interface IOleInPlaceObject.
However, it was defined as:
Code:
interface IOleInPlaceObject : IUnknown
But should have been
Code:
interface IOleInPlaceObject : IOleWindow
This is now fixed. If anyone replaced OLEGuids.tlb just recently please do again.
If not replaced again now it's not an issue "right now" but may become in future an issue.

Sorry for the inconvinience caused.