Just wondering Chiel, why don't you go back to a previous state of your pc if everything was working correct? Why don't you follow the instructions on your account and make back ups of your files? You would be able to get acces to them when things go wrong, if you back them up.
Aerosoft gives support but you can't expect a company to come by your house and 'fix/solve' your specific issue (which thousands don't have). You can, as mentioned, try to air your opinion but try to do so in a respectful way as this will bring you more as you want the company to help you, instead of using the attitude you are using at this moment because that doesn't work in your favour.
I understand it's frustrating if things aren't working as needed and you're one of the few that have this issue but the road you're walking on now is not going to change anything.
Give Aerosoft some time and read this: http://forum.aerosoft.com/index.php?/topic/95083-thoughts-of-a-project-manager-after-sp3/