Haven't seen that. How big are the images? What OS? How much RAM?
These are RAW photos ... about 20mb per file ... I have 24GB of RAM. It doesn't happen all the time and closing the program and re-opening it seems to temporarily fix the problem. Adobe better have a look at this ... do you know how I can get their attention?
You can report a problem here:
But this appears to be an isolated issue because it isn't being reported by others. What are the pixel dimensions of the image? Are you generating 1:1 previews?
And again - OS?
Let's see a screen print of the problem.
OS is Windows 8.1. I am generating standard previews. Pixel dimensions are 6000x4000. For the moment I don't have the problem because I restarted the program so I can't do a screen print until it happens again. It has happened several times ever since I downloaded the new 5.7. It never happened with version 5.6 or any previous versions.
I have same problem but my os is OS X 10.10.1
I've found similar problems after updating to 5.7 with 18mp canon CR2 photos or TIFFs. Lightroom often gets stuck in a loop rendering to the screen. I see "Bezel" windows momentarily appear then disappear in the task bar. The LR title bar shows "not responding". All four CPU's are maxed out at 100%. It will sometimes recover after a minute or two, but usually I have to kill the lightroom.exe process. Of course I have optimized & recreated my catalog to isolate the problem, but to no avail.
Adjustment brushes, zooming in to 1:1 and panning or zooming out will frequently trigger this behavior. Toggling [F] Fullscreen and back too.
This happened very rarely in 5.5, but every 15 minutes or so in 5.7. I only used 5.6 for a short time, so I can't be certain whether that had the same problems.
OS: Win7 64bit,
GPU: AMD Radeon HD 6450 1GB primary monitor,
GPU: AMD Radeon HD 3450 1GB secondary monitor (not in use for LR)
Lightroom 5.7, Camera Raw 8.7