I removed most of the data from all the lists and made sure there was no duplication in the title column in the list and still nothing unfortunately. At this point I can't even make a multi select box (with add button in SP) feed another box. I removed the third cascading box out of the code so there was only the first and second both as multi select options and nothing, the second box always has all data in it. I would expect it to be blank until some multi select options were populated (added) in the first box.
Again, as soon as the second box gets changed to a single drop down (no multi) in the sharepoint column properties, it then will dynamically populate from the selections in the first multi select column.
I have pulled in the lists and their data into an excel sheet if anyone cares to take a looks to see why this isn't working.
http://dl.dropbox.com/u/81356830/SPServicesMulitSelectIssue.xls
Has anyone successfully done this? Have all data dynamically populate multi selectable fields in the sharepoint form as I show above? It is almost as if there needs to be a normal lookup dropdown with no multiple selections allowed somewhere in this mix to make it all work.
Thanks