I remember the message some weeks ago where it was mentioned that a fix was made but that it apparently did not work. I was asked to turn all caching off. I did that. I was also asked to make css changes which I did but that did not work.
I am thinking the fix for this problem should not be an entry in the custom.css file.
The site currently have a very recent replication of my site and as far as I know there are no changes to my side made by anybody at JoomlArt/JoomlaBamboo.
I will not touch this site any more until I hear from one of the engineers there.
Sean