I am looking at my install directory right now (everything in the LIN folder)
In MC, when I have all files selected, and then click file chmod, it shows:
read by owner
write by owner
execute/search by owner
read by group
write by group
execute/search by others
on all files.
Maybe something funny with your ibay?
Copy the lin folder to a different spot on your sever (IE, mkdir twinstall and put it there) double check the perms, and try again.