ALL'S WELL THAT ENDS WELL !
Downloading the Scout/Wasp from Marketplace as i type this... ;-) Pheww!!! Some excersize this turned out to be ! Want to thank you all very much again for trying to help me out of this misery !
I can't tell how many times i've read about MSFS problems that didn't concern me because i run the Steam version. Sorry to say that sometimes i felt a bit smug about that...
(told you, should've bought the Steam version.. ). This time though it was the other way round because that irritating Marketplace problem had nothing to do with MSFS or Marketplace but was purely Steam related !
Something or someone (not me ! ;-) had turned off the 'Steam Overlay While In Game' option. I.e. logically i couldn't buy anything because for me the shop was closed... I followed someone's suggestion to call Steam support instead of MSFS/MP support. That did the trick. Steam support also told me that, quote " Overlay issues are typically caused by third-party software preventing the overlay from activating or incorrect settings in Steam" unquote.
So a good lesson learned. I know what to do next time this'll happen. In the mean time the Scout/Wasp arrived in my hangar. I think it looks fantastic inside and out !
Thanks all again, gentlemen !!
Yiiiiiihaaaaa!!! as the French say