Cause: Very large image uploaded in error to folder.
Solution for me (posting here in case anyone else has same issue) - browse image folder using FTP and remove the large image - everything back to normal.
Don't pay for simple mods
My free modules: Filter resets in admin, Add extra flat shipping, Improved Admin Product Search and Canned Messages.
My site uses (free): Modification refresh button, Additional Alert Email Fix, TLT Structured Data
My site uses (paid): Journal2, Restrict catalog by customer group
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