After installing a new piwik on an ssl only server I had no logos displayed, because of using http:// instead of https:// in the src attribute of the image tags.
This is because the installer had written a wrong configuration to the config file.
In config/config.ini.php:
Instead of
'''[General]
assume_secure_protocol=1'''
the installer writes only
'''[General]
secure_protocol=1'''
(In [6515]) Fixes #3236 Thanks marcusx for the report and patch!! :) Very appreciated