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?
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.