While the concept of realcrypt permission denied has been touched upon in these posts:
(I had this problem too, and by reading these posts, I solved it.)
forums.fedoraforum.org/showthread.php?t=241756&highlight=realcrypt+mount (See post 7 and 13, especially 13.)
I would like to state the solution. My solution worked in Fedora 15.
Note that this guide assumes you have realcrypt and you can access its windows.
1. Go to the top bar and click on settings.
2. Click on preferences.
3. Go to mount options tab.
4. In the textbox to the right of mount options, type your uid and gid (If that does not work, type the uid ONLY. That's what I did, and it worked.)
To find the uid and gid, try something like vi /etc/passwd or nano /etc/passwd .
The uid and gid is in: username:x:uid:gid: (...more is on this line)
username is your username, and uid and gid are self-explanatory.