[otrs] pdf attachments don't display?

In a customer email reply to a ticket there was a pdf attachment. If this is selected, a new browser pane is opened but nothing is displayed. If the file is saved from OTRS to a local folder it can then be viewed OK by going to the folder and double-clicking. This means that OTRS is correctly receiving and holding the pdf, but cannot display it. Is this a bug or am I not meant to try to view pdf's directly? Matthew _________________________________________________________________ Is your PC infected? Get a FREE online computer virus scan from McAfee® Security. http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963