Uploading

Hi all: One of my websites is not allowing any uploads. An example of the error I get is...

“ 2011-02-09_131500.jpg” has failed to upload due to an error
This file exceeds the maximum upload size for this site.

I have absolutely tried everything I know of to fix it:

- Raised Quota in UI
- Checked php ini file (Allow 100megs max)

This happens in all networked sites (in this network) media uploader and Marketplace uploader.

Any Ideas on what gremlin could be causing this?

Thx

Rob