PhotoCoreLog was plagued by errors on around 10% of installations, and worked flawlessly on the other 90%. As this did not consistently occur on all computers, and I could not recreate the error on my computers, it was difficult to identify the cause. The problem was eventually tracked after feedback from users and sections of the code rewritten to overcome these occasional errors caused by Windows Explorer settings.
I am reasonably confident that Version 220.127.116.11 will now flawlessly work on all computers and with all Windows Explorer settings, but please provided feedback if errors still occur. Happy photo mapping!