PDF Optimizer enlarging size of PDFs

Hi
We have a vendor who supplies PDF files to us. These PDF files are around 4-5MB in size, and need to be reduced for the web. Using the Reduce File Size menu enlarges them to around 18MB. Using the PDF Optimizer also enlarges the files to the same size, no matter what settings/presets you use. I've tried 3rd party PDF reduction software, and they either don't reduce the file at all, or crash. No problem with other vendor PDFs.
Looking at the resultant 18MB file in Pitstop, the images haven't been downsampled at all, and have in fact lost their compression all together. The only two ways I have to compress these files is 1) Manually using Pitstop image by image, or 2) printing to PDF using the smallest file size distiller option. Both methods are too slow.
One unusual message comes up after reducing the file size: %% [Error: invalidfont; PostScript program did not contain a font ]%%
If I delete all objects except the images and reduce the file size again, it stops the error message, but the result is still 18MB. PDF version is 1.3 (4.x)
Anybody got any ideas?
Cheers,
Andrew.

Thanks for the reply Mike.
The PDF File Optimizer is what I would prefer to use, and it works very well with most PDFs. Unfortunately, these particular PDFs don't compress using the Optimizer. I've tried many different settings, even dropping the images down to 50dpi, and Low quality, but no matter what settings I use, the files always end up around 5 times the size of the original, and the images don't get compressed or downsampled.
I think the files must all be corrupted in some way, as the only way to fix them is to repdf them from Acrobat, which unfortunately is time consuming, and it's happening to all PDF files from this agency.
Cheers,
Andrew.

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From: Riannosda <[email protected]>
Reply-To: <[email protected]>
Date: Wed, 22 Jul 2009 07:06:34 -0600
To: Pamela Myhre <[email protected]>
Subject: Why does PDF Optimizer no longer reduce size
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