Problem with adding photos on Collage (Pixlr Express)

I can't add any photos when using the Collage feature of Pixlr Express. I tried with different browsers (Firefox and Chrome) but still can't use it. What's weird is that when I used to have Windows on my pc, the Collage feature worked just fine, the photos were added instantly with no problems! Is it because I'm using Linux now?
Has anybody experienced this problem? Is there a solution for it?
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