Issues with Avast
For people asking (because I seem to be the go to person for any kind of computer issue :o), there was a faulty update with Avast that's causing the block to pop up on nearly every site. They've now fixed the problem but you need to update your software.
The fix is here: https://blog.avast.com/2011/04/11/false-positive-issue-with-virus-defs-110411-1/










