Ever since upgrading to Yosemite, I've noticed a handful of sites will require a refresh to load. I will see a blank page with a stalled loading bar, and a click of the refresh generally will force a complete loading of the page. I believe that this was similar to a widespread issue before recent software updates. In particular, I am having consistent trouble with LinkedIn, which I use every day as I am in sales. This is only happening on my rMBP in Safari. I've not noticed it happening in other browsers on my rMBP (mainly Chrome) or on my iMac in Safari. I've tried with AdBlock and 1Password plugins enabled and disabled. I do not have any other Safari plugins or any changes to Safari preferences. Any ideas? Thanks.