Not to worry, Andre.
Paths issues are one of the major causes of headaches around here.
Have you done much style tweaking to your PowerStore pages? Sometimes it makes sense - even for your own peace of mind - just to start with a fresh copy. Now that you know you can quickly redo the WA_Globals.php file and the localhost.php file in the Connections folder, (or use the old ones - as long as they go in the same place) it would put your mind at rest if you just uploaded fresh, all of it to the Shop folder. Make sure you have the most recent version of the download - I think its 1.0.2.
Not sure if you feel this may be an option for you, - either way, please post back with any queries.