When you say nothing happens does that mean that the dialog doesn't open in Lightroom or/as well the RAW file isn't opened in Photoshop 2014.
Both. The dialog box that should come up in lightroom does not, but it launches photoshop but no file opens.
I'm not sure what is happening then because the dialog would only come up in Lightroom if there was a Camera RAW mismatch.
Another thing you can try is delete the "Lightroom 5 Preferences.agprefs" file and restart Lightroom. The file location is Preference and other file locations in Lightroom 5 .
You also may try adding PS again as another external editor which means the dialog should appear for ALL images, I wonder if it is something to do with Photoshop CC and CC (2014) being installed?
Thanks, BKKDon...it may well have been something to do with cc and cc 2014 both being on the system...I recently deleted the old CC version and something may have gone south with that uninstall...
Many thanks...don't know why that darn link didn't show up in my own google search :-)
I opted for the "second" fix...plain old reinstall so I don't make it worse :-)
Now working just fine again.