I have logged a bug for this.
Basically the issue is that "user is a reserved word by the ODBC drivers used for connecting to an Access database. our code is trying to hard to prevent errors when a reserved word is used.
it is forcing the "`" marks around the table name, but those tick marks are hard coded into the query:
$WA_Sql = "INSERT INTO `" . $WA_table . "`
it should do one or the other, but not both. thanks for bringing this to our attention.