in a way it makes sense
but I just read recently that eCart (which seems to create the problem) will stay "standalone".
I agree that packages have advantages but it is also quite expensive, after having bought each single extension. In times where everybody creates wordpress pages which is a great tool (with a lot of free modules for many solutions) professional webdesigner live not without competition from that corner.
I re-installed in your suggested order - same problem. Must have something to do with eCart5, I guess: