A few days ago, while using 'Add Image' to upload an image to my site (which uses the Suburbia theme), a blank gray image box suddenly appeared with the other existing images, and since then I haven't been able to change the alignment or size of any photo while in the 'Attachment Display Settings' area: it's stuck on 'Center' and 'Full Size', and though I can change both in the dropdown box, neither ever 'sticks'...it reverts back to 'Center' and 'Full Size'. I also cannot remove the gray box. Then when I tried to add an image to my other blog site today (Coraline theme), the gray box appeared again, and now I can't change alignment or size there, either! Help!
The blog I need help with is derbykiller.wordpress.com.