I have been haing a problem with media files on my new installation of WordPress. Two things are going wrong.
First, the multi-file uploader does not work at all for my Windows 7 64-bit system to upload jpg files. I can upload single files using the browser upload.
Second, when I try to add media to a page from the image library, jpg thumbnails are blank with Xs in them. When I click on one of the blank thumbnails, I can place it on the page, but I work "blindly' in that no image shows up on the page until I publish. Until then I only see a blank box on the page with incorrect dimensions.
I checked file permissions using Filezilla, and wp-admin, wp-cvontent, and wp-includes primarily have folder permissions of 705 and file permissions of 604. My webhoster insists that the user group settings of zero are fine for WordPress. Anyone have any experience with this? I am on a shared system, and want to keep permissions as low as possible for as many files as possible.