Hello, Koudgen!
I am glad my method worked for you and solved your problem! Yes, it takes time if the damage is extended; it works the best when it happens to notice the issue early...
About the disk space reasoning: when it happened to me, I had no disk space issues. I am not saying that this couldn't be a possible cause but not in my case though. I guess that it is possible to have more than one causes that trigger that malfunction.
That thing you mention with the increasing depth of 'storage/imported folders' is really annoying. I have noticed that myself and it is really painful when you have to navigate to all those clones to find where the latest version lies!
I have ended up that Windows Live Mail is really fragile. I am not sure if I 've read it on this thread or on another one, but it is said that Windows Live Mail should be treated gently, meaning that after you close it and exit you should always wait for some time before you re-open it or before you shutdown your PC otherwise issues may arise.
Best regards
Nick