HDR Merge not working

[Andrew Fletcher UK]

When I choose for example 3 images to merge, I go to the option (Photo Merge > HDR) then nothing happens.

I am using windows 10

This seems to be since the latest update as it worked fine before?

Please help or fix, I love my HDR's

[Ian Lyons]

It helps a lot when you provide more information than you've done. For example, what operating system are you using?

Alos, have you tried resetting Lightroom preferesnces as these can become corrupt on updates - see Method 1 https://helpx.adobe.com/lightroom/help/setting-preferences-lightroom.html

BTW, HDR Merge working fine in macOS 10.15.2

[GoldingD]

And another possible diagnostic if previous one fails. Cold boot the computer 

[GoldingD]

As a possible diagnostic purge your Camera RAW CACHE