I'm still guessing that the users that are experiencing the problem have something amiss with their address details. eg, postcode missing.
There IS a known problem whereby the URL for one of the icons can be too large to store in the database field, and this MAY be your problem, but without knowing which of the many links is actually broken this is nothing more than speculation.
Having said that, if you locate the file /includes/languages/english/modules/shipping/austpost.php you'll see that the definition for the module title contains an image link. If you remove this link and see if the problem goes away or not you'll have your answer.
However, please note that this will only affect any new invoices. Existing invoices will still have the possibly overlong text string.
An alternative solution (if this is your problem) is to increase the size of the relevent data field in the database, again, this will only affect newly entered data, and I *don't* really recommend this is a solution (because the code causing the issue will eventually be rewritten).
Cheers
Rod
ps. the autpost.php file mentioned above is a very simple file to edit. It doesn't have any actual 'code', it only contains the various text strings used by the module. (another reason why the image link is misplaced).




