Bulk update not working

Hello,

After I upgraded from v1.1 to v1.2 the bulk update stopped working.
I get this error messages while trying to update :

Notice: Undefined index: title in _batch_progress_page_js() (line 127 of /includes/batch.inc).
Notice: Undefined index: error_message in _batch_progress_page_js() (line 135 of //includes/batch.inc).
Notice: Undefined index: init_message in _batch_progress_page_js() (line 136 of /includes/batch.inc).

..and is not updating anything.
/Blue