Media Library still lists all the previous files, and allows me to upload new files, but all the Thumbnails are white.
Step 1: View Library. All thumbnails are white. http://cl.ly/image/1B1q0o45111b
Step 2: Click on Image name to enter the Image Editor, then click "Edit Image" button. http://cl.ly/image/1X1i1a340f2N
Step 3: ...and "Image Data Does Note Exist" error appears. http://cl.ly/image/1U2H3H0W2n1g
FTP Permissions on the folder: 755
FTP Permissions on the file from screenshots: 644
I have already attempted to disable all plugins. Didn't fix it.
I then switched to the Twenty-Eleven Theme. Didn't fix it.
I'm pretty sure this happened when I upgraded to 3.4.2. I have another WP site running on the same host, in a near identical setup as the problem site, running 3.4.1. I can see Thumbnails there just fine.
I just re-installed 3.4.2. Didn't fix it.
Any other ideas here? Thx!