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has he tried to click the circle to refresh balance

Yes. Also helped him to add funds to Bitpay and nothing happened.

If he is using it for bitcoin i would tell him to using electrum. as the reply below states why as well i only hold very small amount ETC and DASH in jaxx

i would be careful using jaxx right now i used to use it until i seen talk about it got hacked last week here is a news article with a few of their concerns about it
http://bitsonline.com/jaxx-vulnerability-bitcoin-risk/

I had a problem on one computer. I took my seed and loaded it up on another computer and it worked just fine.