Ok,
My symptoms are as follows. I am using WP 2.5.1. I access the admin panel through a redirected link to the WP Admin login window from Joomla. I have seen on other forums as well that in such cases where one is accessing the admin window through a redirected URL, then there are problems with the Media Uploader. I can upload images fine. It is when I try to insert the uploaded images, or images from the gallery or library, that my screen goes blank, and I cannot proceed any further. The image is not inserted into the post in this case.
So now, I logout, and login using /wp-admin. Images insert into post just fine. THere had been suggestions in some posts that accessing the admin front-end through tabs cased a similar problem, but I could not reproduce this. From my end, it seems more like a redirect issue. Accessing the admin front end from the meta tags also works fine. I however to not want to leave the meta on my public site. I need the redirect because I also have other authors for my wordpress, who are not as tech savvy, and will not always remember to type in the /wp-admin to enter the admin panel. Any ideas Otto42??