On my PC I have malwarebytes and super antispyware, but not resident.
Win 7 x64. Issue also presents on win 7 x86.
But it doesn't matter, this issue presents itself on brand new machines, with freshly installed OS and Fresh installation of avast.
The DAMN server replies "There isn't newer VPS version" even if my VPS is a week old.
If you have an older version of avast (e.g. 7), it works fine.
If you have avast 9 and
a)a VPS older than 140421-1, then avast will update, but only to version 140421-1, not to the current version.
b)VPS 140421-1, avast won't update, says it's up to date, which it obviously isn't.
c) you use the offline updater to update to a version newer than 140421-1, then avast "updates" to the same version every time you turn on or reboot the PC or on schedule.
d) you get stream updates, but not regular ones.
I live in Chile (south america, in case you don't know).
It's driving me insane.
About 12 days ago we experinced this exact same issue, identical problems. Only after the avast team requested my update.log file the problem was solved.