I have done the delete all preferences thing and I have a heap of RAM and scratch disk space. PS crashes as soon as I slect Photomerge - I don't even get the chance to load the files. PS Elements handles Panoramas easily.
It gets even more interesting.
I downloaded the cc Cleaner tool - but it came as an .exe file not a .zip So I ran the CC cleaner tool.exe file - which ran in a DOS window !!
It said it had run successfully and gave the path to the log file. The log file is not there - nor anywhere else that I can find. PS starts as normal from the desktop icon !!
I'll try uninstalling from the Control Panel and reinstall.