I’m new to WordPress, so I don’t know whats before WordPress 3.1. But with WordPress 3.1 I also have sometimes HTTP error after image upload, and no crunching takes place.
The thing I found out for me: it seems to depend on the resolution of the image.
2200×3287 and smaller works
2300×3436 and bigger don’t works
It doesn’t have to do anything with the size of the image. I save an image with low quality but high resolution, the image had a size of just 500 kb. This image also doesn’t work.
I increased memory and max execution time in php.ini. But it didn’t help.
There seems to be another parameter, which is limiting the maximum working resultion. Any ideas?