After the last (comfort) updates the HTTPS sign in Mozilla says the https connection to the admin panel is not secured ue to mixed content; while the questionaires itself are reported secure (green lock)

Mixed content:
/images/lime-icons/328637/global.png [Gemischte Inhalte]
/images/lime-icons/660B0B/user.png [Gemischte Inhalte]
/images/lime-icons/660B0B/global.png [Gemischte Inhalte]
/images/lime-icons/660B0B/tools.png [Gemischte Inhalte]
/images/lime-icons/660B0B/expressionmanager_30.png [Gemischte Inhalte]
/images/Limesurvey_logo.png [Gemischte Inhalte]
/images/lime-icons/big/328637/add.png [Gemischte Inhalte]
/images/lime-icons/big/328637/surveylist.png [Gemischte Inhalte]
/images/lime-icons/big/328637/global.png [Gemischte Inhalte]
/images/lime-icons/big/328637/shield-update.png [Gemischte Inhalte]
/images/lime-icons/big/328637/labels.png [Gemischte Inhalte]
/images/lime-icons/big/328637/templates.png [Gemischte Inhalte]
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ok, so you're testing the LimeSurvey 2.5 Release candidate right ?
the mixed content you're reporting will disappear in the next build : we'll use font icons rather than png.

Version 2.5RC Build 151008
I used the comfort updater and wanted to install the pending updates.
I installed the first one (unstable) and wanted directly after that update to the second (stable) one; but now the comfort updater is not working. Known issue?

Since some minutes:
No server answer
it seems that the Comfort Updater is not responding for now. Please, try again in few minutes, or contact LimeSurvey team

edit the file application/config/updater_version.php
find : replace by :

Perfect. Works.