UserAppDataPath not returning a value ?

I've written a program in C# Express and can run it successfully on my own computer. This program uses the Application.UserAppDataPath property to store my selected options in an xml file.

I've deployed this program via ClickOnce from my web site to my girlfriend's machine. When she tries to run the program, the program won't save her options like my copy does. There seems to be no UserAppDataPath being created on her computer, and so the program doesn't run right.

Is there some kind of limitation of ClickOnce deployment, or something security-related I haven't enabled or some such?

adam

[685 byte] By [adamoneil] at [2007-12-24]
# 1
I should add that no exception is thrown when the program runs on the other computer, it just doesn't do what my copy does--even though it's the same .exe.
adamoneil at 2007-10-8 > top of Msdn Tech,Windows Forms,ClickOnce and Setup & Deployment Projects...
# 2
what OS is this other computer? Just out of curiosity
ahmedilyas at 2007-10-8 > top of Msdn Tech,Windows Forms,ClickOnce and Setup & Deployment Projects...
# 3
XP Pro
adamoneil at 2007-10-8 > top of Msdn Tech,Windows Forms,ClickOnce and Setup & Deployment Projects...