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Perhaps it was not clear from my posting: the upload process completes successfully prior to the point where the exception is thrown. Moreover, I have checked the type of the form variable, 'the_file' and it is correct as is its contents.

I'm not sure what else to try. Are you saying that manage_addPhoto completes *before* the exception? The exception you posted is pretty clear to me -- line 8 (before manage_addPhoto), no 'the_file' key in the 'request' var. How can the line after it be successful if this is the case?

On first reading your response, I thought there was a difference between the code generating the error response and the code I posted. Just to be sure, I reran the test case and, yes, you are right. The exception identifies the line just before the manage_addPhoto call. BUT, by the time the execption is raised Photo has already successfully added the photograph. I am at a loss to explain the fault. The passed in REQUEST looks fine if I replace manage_addPhoto with a script the dumps REQUEST to the screen. The 'the_file' variable is a FileUpload object as I would expect. Whatever is going on, it's very repeatable on my system. Thanks for your help.