Hi Eddy,
the problem is that avast is currently blocking the use of some sites that are accessed via https as it puts an self created cert into the connection and the browser (Chrome+Firefox) throws an error.
Some examples:
web.de uses (without avast) a cert which is issued by T-Systems International GmbH.
with avast enabled I get "generated by avast! antivirus for untrusted server certificates"
Firefox tells me that this certificate couldn't be verified as the issuer is unkown
same for leo.org .
For freenet.de login it gives:
(auth.freenet.de verwendet ein ungültiges Sicherheitszertifikat. Dem Zertifikat wird nicht vertraut, weil keine Zertifikatsausstellerkette angegeben wurde. (Fehlercode: sec_error_unknown_issuer))
Once disabled the web shield can't be enabled again without a reboot.
I've reinstalled avast and after the installation of version 10.0.2206.692 all works as expected. Then avast come up with an application update to version 10.0.2208 and it doesn't work anymore.
I'm going to disable avast until a new update. hopefully it will fix these problems. I've tried to open a support ticket with these informations but I'm not sure if it was transmitted as the browser jumped back to the first support page and I didn't got a confirmation mail.