When i edit a photo, red blobs are appearing all over a photo when the slightest of changes are made.......however, the preview to the left is fine and when the photo is saved the photo it is fine but I can't see the exactly how the photo will look once edits are complete unless i save it first! Why is it doing this and is there a way around it please?
Can you post a screen shot?
Which tool do you have active when the red blobs appear?
Version of LR?
OS and version?
File formats you are working with?
In the top right side of the Histogram there is a small triangle which when selected causes overexposed areas to be displayed read. Click to turn on / off.