On the machine who I use Pharo (Notebook with Windows 7) is in the Dropbox folder (C:/Users/MyUser/Dropbox/Pharo). And it is the same directory as the desktop PC (Windows 8.1).
But I think I found what the problem is. When Pharo opened from the desktop (C:/Users/MyUser/Desktop/Pharo) did not walk, but when I ran from disk (C:/Pharo) worked well. After I opened it from another disk folder (C:/AnyFolder/Pharo) and also worked. But I went back to put it in user folder and didnt works (C:/Users/MyUser/Documents). So the problem is the name of the folder "MyUser" (userfolder). The userfolder in my PC has a tilde (ascento is Spanish) because it is a Spanish name. I affirm that this is the problem because I created a folder with accent on the disk (C:/fólder/Pharo) and did not work.
And the problem has no solution but to change the name of the user folder. And is a little hard work.
Thank you.
"Solved" Problem...