gloeglm

I got this fixed:
Theoretically, the “Times in the weblog should differ by” option on the “general options” page should solve this (setting this to 2 in my case). However this was never saved due to a missing row in the database.
Manually inserting this by
INSERT INTO wp_options ( option_id , blog_id , option_name , option_can_override , option_type , option_value , option_width , option_height , option_description , option_admin_level )
VALUES (
”, ‘0’, ‘gmt_offset’, ‘Y’, ‘1’, ‘2’, ’20’, ‘8’, ”, ‘1’
);
fixed this. Posts from w.bloggar now immediately appear in the blog.

This seems to be because of time-zone related issuse. Posts created through the backend have post_date = post_date_gmt = 19:00, Posts created by w.bloggar have post_date_gmt =19:00, post_date=21:00 in my case. Both server and local PC time are 21:00
I will incestigate some further.