Version:            (using KDE Devel)
Installed from:    Compiled sources
OS:          Linux

As far as I can see, the following applies to any situation where you can launch a program.

When KDE tries to load a program with missing/incompatible shared libraries, loading fails silently without giving any explanatory message to the user.
This is obviously a bad thing because they will think the program just "doesn't work", and they have no way to fix it. Even worse, they might try to update the program which obviously won't help.

When a program cannot be loaded because of linking problems, KDE should present the user with an error message just like the one that appears when a program cannot be loaded because the executable doesn't exist.

Note: I do realize that the way Linux loads program could make this difficult and awkward. I just hope that you can fix this as good as possible :)