Avatars missing after upgrade to BP 1.7.1 or 1.7.2

[JDoe]

Here is a tip in case the Avatars are missing upon upgrade from 1.6.x to 1.7.x

Navigate to “Settings > Discussion” and under “Avatar Display”, check “Show Avatars” and save.

Source: http://buddypress.org/support/topic/avatars-not-displaying-after-upgrade/