Well, the problem went away. Didn't come back even after closing browser. So maybe it was a twitter-syndication problem after all.
Once I click on "Block" for each warning then the page completes loading. There is another choice "Always block document requests from TiVoCommunity Forum to Sign in - Google Accounts". These script blocks have occurred occasionally in the past couple of weeks but today it's happening on every page.NoScript detected a potential Cross-Site Scripting attack
from TiVoCommunity Forum to Sign in - Google Accounts.
Error: Timeout! DOS attack attempt?,(URL) https://accounts.google.com/o/oauth..._features__#rpctoken=2104463770&forcesecure=1