okay this is a long shot!
I've searched the internet for anything relating to this and drawn a blank so i joined up here to see if you guys have any idea!

I recently moved my copy of reason 4.0 from an old g5 mac to an new iMac (yes it's also mac related) including my lib ray of patches and samples.

Now reason will start up and in the library the patches will be there but randomly drop out. it's hard to describe....

i click create instrument.. and go to the 'reason factory sound bank' and the file in the patch browser seems empty.... but this seems also to be happening randomly. sometimes it is there then other times it is empty.
Reason obviously always finds it upon opening or it wouldn't open at all.
if any one has any idea.... possibly also any idea on how reason creates its file structures....