I don't know when it started, I just noticed it maybe one or 2 weeks ago. In Collumn view when I display XMP file which contains Adobe Camera Raw data for my photo it doesn't show the contents anymore. Only shows blank file icon. Same when I hit spacebar. It was working before and I was using it to quickly check the text data for what white balance I have set for other photos from same series. The XMP file itself is okay as it works in Camera Raw. Any ideas what could've caused it?