I don't know if I'm getting the same '/' problem as him, but I'm getting the following problems in Mozilla Thunderbird and in Squirrelmail:
Mozilla Thunderbird 0.5:
Squirrelmail
There seems to be some sort of problem with double slashes.... I might be able to dismiss it as a problem with thunderbird, but squirrelmail definately has problems.
I created a folder called "business" and then tried to create a subfolder called "battlesim" under it. The process in squirrelmail failed.
Create a folder, then try to create a subfolder under it to reproduce the problem. I did not add the extra '/' -- squirrelmail did. Is this the problem you're talking about, bluetale?