Particularly the “Windows” download or when you try to sign in using the buttn on that page.
If you try to download TweetDeck with HTTPS enabled, it just fails with error:
Secure Connection Failed
An error occurred during a connection to downloads.tweetdeck.com. security library: improperly formatted DER-encoded message. (Error code: sec_error_bad_der)
Mine Win 8.1 64b VM + FF 35 + latest Avast! working fine So, if you could provide us a support package it would be great (http://public.avast.com/supp/util/avastsupport.exe - i guess that you know it - just to make sure)