I've also had issues with this.
When I go to upload a photo it will just take me to a blank screen.
When I refresh the browser, it simply takes me back to my profile.
I've tried using other devices, but have had no success.
How big are the photos? I remember doing a try and error thing when I wanted to post a picture to my profile.
I still have some of the copies I uploaded and they're JPEGs with 640x480 pixels on average, weighting less than 90Kbs.... Maybe you should tried resizing them to something similar and see if you can upload them. I remember doing it several times until it worked.