I'm new to Lightroom and was in the middle of learning how to use the healing brush to remove dust marks when my monochrome photo I was working on suddenly becomed sepia toned. I tried the 'Back' command in case I'd done something but it only undid my healing tool actions. Now whatever photo I click on displays with a sepia cast whether monochrome or colour. The cast isn't present on thumbnails or anywhere else, only when I have a photo open. Restarting Lightroom makes no difference.
I found advice via Google that it may be due to monitor colour profile but I don't understand why the sepia only appears when I have a photo open and why thumbnails look normal. Why would it suddenly change for no apprent reason? It was fine before....
I'm using a PC with Windows 10.
Any ideas?
Thanks.
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