Mozilla 0.97 and 'upload' input_type widget
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If you configure the IMAGEURL (or equivalent) url to
use 'upload' or 'upload_or_saveurl' widgets, and a
user tries to add/update item without specifying
an image to upload, the form will sit there waiting
forever.

The really strange thing is that if after sometime
you hit the stop button, the update is actually
performed.

The workaround is to upgrade to 0.98!!