I recenlty ugraded to lightroom 6 on a PC with windows 8--and I can use the library fine (most times) but when I click on "develop" the program is not responding. I then have to turn shut down the program and start again...and this continues the same. I have to use lightroom 4.4 as my backup. I have tried mulitple times by reinstalling the software.
Try disabling the GPU.
Go to Edit > Preferences > Performance, uncheck Use graphics processor.
If you are unable to uncheck the box, or if LR hangs when you try to, you will have to disable the GPU by editing the preferences file.
Close Lightroom. With Windows Explorer, navigate to C:\Users\[your username]\AppData\Roaming\Adobe\Lightroom\Preferences
Open the file Lightroom 6 Preferences.agprefs in a text editor, like Notepad.
Close to the end of the file there is a line that says useAutoBahn = true, - change this to useAutoBahn = false,
Save and close the file. Now launch Lightroom.
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