I am having difficulties uploading files when I'm writing posts.
I click on the browse button, and locate the file I want (for example an AVI file of 5Mb). The filename is displayed in the box, and then I enter a title and description for the file.
When I click on the upload button, it thinks for a few moments (firefox says 'sending request to <mysite>') then clears out the filename, title and description fields.
When I then publish the post - there is no sign of the file.