Try simply advancing to the next image in the filmstrip, and then going back.
Thank you Jim for replying. I tried clicking on the next image, but it did not update the photo, and then I tried clicking on the previous image, but still no update. It is updating in the Gallery module, but not the Develop module.
I wish I had an answer for you. I don't use Topaz. But I just tried using one of the Nik plug-ins in Lightroom 2015 CC. I didn't have any problems. The changes were visible in Lightroom. What operating system? How much RAM?
It is happening with adjustments made in PS CC 2015 as well.
My machine is a WIN 7 64 with 24 gigs of RAM.
Everything worked fine until I upgraded from LR 2014 CC to LR 2015 CC today.