Bit of a head scratcher this one. It took me a while to fix an issue with the WordPress image uploader (the multi-file uploader). You try and upload an image and it stalls at ‘100% crunching’. It doesn’t refresh and display the uploaded image, even though the images are present in the upload folder.
In addition, when trying to insert new images into posts, none of the images in the media gallery were appearing.
WordPress support forums are usually great for this kind of thing but after going round in circles – and having exhausted the media uploader troubleshooting list – I managed to fix the image uploading issue by inserting the below line into the functions.php file of the theme I was using:
This will basically disable the Flash aspect of the image uploader, and the uploader seems to work fine without it.
Hope it helps!