Hi,
I am having the same problems after updated to Avast 2014. Everything was normal, now i can not watch twitch tv streaming anymore.
My info: Windows 8, Avast 2014 (lastest program and virus definitions), up-to-date Chrome.
Problems: Twitch tv streaming video keeps refreshing every 5s (the Avast icon turns constantly), everything else is normal (webpage, youtube, etc), no warnings.
Some did not work efforts: Disable Avast extentions in Chrome, disable Reputation services, clean up Browser.
I tried disable Web shield and it's good though .... Very frustrating cause it was totally normal before i updated to Avast 2014 >"<. Now i have to Right click Avast icon -> Disable all shield -> Open Chrome and Twitch -> Enable shield again.
Hope there will be solution soon.
Regards,