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I have a function to generate an 11 character salt. This salt can include characters like % which I know is wildcard in SQL and \ which is used for escaping things. Some users are complaining about not being able to log in. Could these characters in their password salt be the problem?
Unequivocally yes. specifically the backslash if it is not done correctly. If you are doing this salting/hashing in mysql only that is a bad idea, i would suggest you perform it in a server side language before storage, and if you are already, you could always sha1 or md5 your hashed result before storage.