Can't use # in filename saving remotely

[Sysop100]

I took a trip out of town this past week. Until then the 1511 I have used has been mapped as a local drive here on my lan. I can save files all day long with the # in them (title). When I got out on the road and tried to save the file or email remotely that has the # in it I would get an error and had to remove this character to be able to save it. Any ideas?
I'm using windows on a company laptop and have the 1511 mapped in Network places using the WebDav port.

Thanks....

[Sysop100]

I guess know one has come across this issue?