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This reminds me of an installation problem I just had.
The install asks for a virtual path with no trailing slash. The particular server I was using had no physical path, so it was at the root. But, since a "/" was not supposed to be entered... and since the install would not allow me to leave it blank, I input a "space" character.
Then, after the install was done, I edited the mainfile to so that the physical path was ""
I thought that's what this thread was going to be about.
Anyways, mainfile.php is the file to edit.