Experiencing Problem With ColdFusion's ExpandPath('/') Function

For some strange reason, I've been experiencing a (very weird) problem with the ColdFusion function ExpandPath('/'). I have several web sites on various ColdFusion servers in a shared-host environment. Under normal circumstances, ExpandPath('/') would return the base absolute path for the web site.

For example, if you try using ExpandPath('/') in the default ColdFusion installation, it would most likely return "C:\ColdFusion8\wwwroot\"

However if a site is set up in a multi-instance environment (versus the default installation), ExpandPath('/') should return something similar to: "D:\Inetpub\domainname\"

Where I'm confused is why ExpandPath('/') would return "C:\ColdFusion8\wwwroot\" in a shared-host environment. It just doesn't make sense. Stranger still is if I try ExpandPath('/index.cfm') the shared-host server actually returns the correct response of "D:\Inetpub\domainname\index.cfm"

Why do I care? Well, I would be surprised if I'm the only ColdFusion developer who uses ExpandPath('/') in their programming. I usually store this handy little function in a variable and call it out from time to time in various parts of my applications for those times when I need an "absolute, platform-appropriate path." There are many functions that require the absolute path including the drive, directory, etc.

For now, I've come up with a hack to address this but I would prefer to find out what the cause of the problem is.

Option 1, possibly the easiest to implement, but not as dynamic:

Option 2, easier to replicate throughout multiple sites without have to retype the actual path:

Obviously, none of these are as easy as what I would prefer to do: