If jquery update is enabled and you try to attach a file attachment you get an error "An HTTP error 0 occurred.
/upload/js" when clicking the "Attach" button.
Disabling the jquery update module (and changing nothing else) removes the error.

Drupal is 6.19

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cudeso CreditAttribution: cudeso commented
Title: Enabling jquery update prevents file attachements » Enabling jquery update prevents file attachements [solved]
Status: Active » Closed (fixed)

Solved.
Replaced the jquery.js (version 1.2.6) in /misc with a newer version (1.4.4). The problem in the 'add attachment' went away.