I think it's all fixed now, can you try to upload again, I've done large image upload tests and it's fine.
If it fails again, can you try creating a new topic and posting the same image there please, I think there may be some corruption in the tables around existing posts.
'Yea, Though I Fly Through the Valley of the Shadow of Death, I Shall Fear No Evil. For I am at 50,000 Feet and Climbing.'
Just finished getting up to date on this master piece. Have been feverishly been making notes of some of your currant techniques and the reason you have changed or found a different way to use materials. A very hearty, Well Done:) .