I am just trying out the Free Trial of SD.

Here in southern Germany I am unable to see the standard Airspace C starting at FL100.
I can see C starting at FL130 in the alpine area, but not the standard C in the flatlands.

Same goes with airspace E. Visible when the lower limit is off-standard (like 1000ft)
but not when standard (2500 ft).

What am I doing wrong? Thanks a lot!

(and yes, I have well planned a route high enough - currently FL150)

I can only re-iterate that FL100 or 10,000 feet MSL is not outrageously high when flying in Alpine regions. I certainly would expect SD to alert me to class C airspace infringements at that altitude. Whether I am familiar with German airspace structure or not is secondary. I bought SD because I want to rely on one piece of software for my cartographic needs and worries. This is no small matter to me, either.

In Hungary, for example, there is a blanket class C airspace above 9500 feet. It doesn't show in SD. What other airspaces are omitted in other countries? This really weakens my trust in SD as a VFR navigation platform.

You don't have to show that kind of blanket airspace on the map. But I would certainly expect to be warned when doing a "What's here?" on any point and I want to be warned before entering such airspace. And it also ought to show up in the certical cross section view. You could also show it as a warning under "Flight Details" such as you do with other issues.

-- Chris.