no show file or view file buttons

Hi, updated to r5047 and I've lost these two buttons when I click on a pdf. Instead all I have is a greyed-out View and a Locate which tells me that the URL is not valid when I click on it.
I had all my pdfs stored as files not snapshots in any case. I can still open the pdf by double clicking on the middle pane.
The only error (assuming this isn't designed behaviour) is this

[JavaScript Error: "this.item.getFilename is not a function" {file: "chrome://zotero/content/bindings/attachmentbox.xml" line: 265}]
report id 1644612308

don't know if it's related. Firefox 3.52 Ubuntu 9.04

Regards, Jon.
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