[Plugin: WordPress HTTPS] Famous redirect loop

I’m trying to set up SSL for single posts or the whole site, but neither works.

Example Post

I always get the famous redirect loop (“Too many redirects”), forcing the “https://” back to “https://” and so on.

What to do?

My setup:
– SSL certificate by Geotrust is working: Example
– SSL is enabled for the WordPress admin (working fine)
– I’m using WordPress 3.1 with HTTPS 1.8

A big beer for solving this riddle…

Best,
Frank