When I edit an image in Photoshop, the image doesn't appear in Lightroom. Instead, I'm taken to a blank grey background where the image would normally be. If I return to grid view in the Library module, the .psd is not visible. Filtering by metadata shows that there are no files of type .psd in the current folder.
If I try to synchronise the folder, the .psd file doesn't appear; if I uncheck 'do not import suspected duplicates', I can see the .psd greyed-out, and the hover text informs me that it's already in the catalogue.
Any ideas what might be causing this bizarre error, and what I could do to fix it? It started without precedent a few days ago. I've tried restarting both Lightroom and Photoshop, my computer, and reinstalled Lightroom.
I'm using Lightroom 4.4 and Photoshop CS6 on Windows 7.
Thanks in advance for any ideas!