hi Roger,
try using the function without a path variable. i.e. on your main report auto-refresh function change the syntax to
WEAutoRefresh(15, "")
notes:
a path only needs to be specified if you need to satisfy any end user prompts...as per the users guide.
this function can not override report specific settings in the cmc. i.e. if any user is not allowed to refresh the report then this will cause an issue and most likely an error in the browser.
ensure that you are not using a scheduled instance.
ensure that the report in the cmc does not have the Save Data With Report option checked.
-jamie