Explanation of hashes here..
http://www.webopedia.com/TERM/h/hashing.html
To put it simply, hashes are the ID code for the file..
I have no idea why you have run into problems with your files being hashed..that's a new one on me
I can only think there is a file in there which LimeWire is having a problem with.
I can only suggest that you break down your files into sub folders and introduce those folders one at a time to LimeWire and see where the problem stems from.
Anyone else seen this before?