twertsy,
I upload all my photos to Photo Bucket, then link the IMG code to any thread on GG, GJ, or PW. It never fails except when they're doing maintenance on Photo Bucket (seldom). With Photo Bucket/IMG code you don't have to worry about photo sizing/resizing.
The only thing you have to remember on PB is: NEVER DELETE A PHOTO FROM YOUR BUCKET. This will cause you to loose ALL the photos you've posted on all three sites.
So get with the PB...