Hi all, I was spitting back a formatted string from PHP, using a slash as a divider (i.e. "Part Name / Part Number / Part Type") and autocomplete with mustMatch on was rejecting anything and everything. The reason appears to be the special characters in the string. Using spaces or letters as dividers now and it's working A+.
Posting this for anyone else who has the same problem. keywords: jquery autocomplete mustmatch empty input box always reject selected Cheerios, Marc