Unfortunately I have no idea what is causing either of these, based on the information given. It's certainly not an error I'm aware of on any other installations and I would suspect limitations by your PHP server. There is a small possibility that some of the changes in Moodle 1.0.1 may have fixed your first error (on uploaded files).
I've written to you via email for more details.
Re: Error with uploading images and graphics and files
ó $a->name - $a->date
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