Problem Designating An Audio Drive

[guitargypsy]

Since I upgraded to PT8 I get the following message when I try to save the initial session on my external hard drive:

"Session must be on an audio record volume. If permitted, set the volume(s) in question to "R" (record) in the workspace."

When I go to Setup>Disk Allocation and try to do this, PT crashes.

Any suggestions? I know the hard drive works because I have earlier sessions saved on it-PT recommends using an external drive dedicated to audio.

Thanks.