Most of the times, the portfolio page opens fine. Other times it shows like this: http://d.pr/i/N3Rg/WHpiDn3o
If I reload the page then they show up. So... it seems that some of the images are not downloaded properly, causing the issue.
Can this be because of memory or something similar?
I can't give you a constant pattern or when this happens. It is just random.
Thank you for your help.