Cannot open PDF files from Zotero

I get this weird error message when I try to open pdf files from Zotero:

"/media/.../zotero/storage/CTR5F4T4/JMB531.pdf could not be opened, because the associated helper application does not exist. Change the association in your preferences."

Does anyone know how to let Firefox/Zotero open the file inside a tab as it did before?

However I can open pdf's in a new tab from other websites, eg using Adobe Reader plug-in viewer.

My Firefox Application preferences are:
PDF document (aplication/pdf) Use Adobe Reader 9.3 (in firefox)
PDF document (aplication/force-downlode) Use (default)
PDF document (aplication/binary) Save File

One other point: I get the same error message if I go File->Open from within Firefox.

I am running Ubuntu 10.4, with adobe acrobat 9.3. and Zotero 2.0.3, and Firefox 3.6.6.
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