I tried to upload a couple pics to update an old thread, but I got the error that the upload directory was full. Maybe someone needs to flush some files or something? 
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I'm showing about 8GB available on the partition where we keep the site data. Also, my test image went up easily. How big are those images you're uploading?
1.8Mb JPEG, I think I was set at 4.0MP. I'll give it another shot.
EDIT: Tried again, same error. Shrank the image to 880KB and tried again, it showed up once in the preview page then started getting the same error.