I'm writing this while I am waiting to my uploaded batch to upload a second time. I can't count how many times my uploads had failed there. I must had uploaded 250 images there on 320 try. It failed in many ways...

1- Not all selected images have uploaded.
2- (Upload lost) The uploaded images result page won't load and uploaded images are not in history.
3- Keyword are not uploaded with the image.
4- It sometimes take twice the time to upload an image there than elsewhere

I forgot the other reasons, because I'm making hypnotized therapy to forgot about this. Other than that 123RF is a good place to be, but the uploads there driving me 

Personally I find 123RF a joy I have uploaded nearly 500 images in the past 5 weeks and they have never missed a beat for me, wish the sales were better but that's another story.

David