Yep, same error as everyone else. Blue Iris 4.5.6.0 and 4.5.6.1 has a broken web server. If you want to temporarily downgrade Blue Iris to the last working version while we all wait for a fix, I linked the 64 bit update installer here: 4.5.6 - May 17, 2017Looks like this is reported, but for extra emphasis I'm getting an error after my BI upgrade this morning.