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)

Hi,

the Situation presented by Daniel_KDF is sometimes a big problem. A problem that can ruin you. As a matter of fact I witnessed exactly what Daniel mentioned, on the Frequency of Munich FIS. Some Guy flew northbound in the area of Kempten, where the Alpine Class E Airspace ends. That pilot flew right into the C Class Airspace. The nice Lady on the Radio advised him on that and that he had do descent at once. It was a very hot day and everyone was flying very high that day. 
I am from southern Germany and was trained in that area north of the Alps, so I'm well aware of that airspace stepdown. You Can "see" it in the printed map and also in Skydemon, but only if you are aware of this circumstance.
You can produce the same problematic Situation if you fly from Austria to Germany in FL130 or higher, northbound. Again you will fly right into C airspace without warning. 
Skydemon does display the TRA's above FL100, for example EDR207B which is north of Kempten and begins at FL100.

I think the poses a big problem for pilots who are not aware of this airspace situation and Skydemon should warn you in the same trustworthy manner it always does.