Hey Graham, I'll keep trying but disk utility isn't turning up anything. I tried to pay close attention to the time the indexing started this morning... and then looked at the console log to try to narrow the search... the system log. Anything loook out of the ordinary?
May 28 09:57:42 MyCOMPUTER kernel[0]: hfs: summary table not allowed on FS with block size of 2048
May 28 09:57:42 MyCOMPUTER kernel[0]: hfs: could not initialize summary table for Google Chrome 43.0.2357.73-44.0.2403.18 Beta Update
May 28 09:57:42 MyCOMPUTER kernel[0]: hfs: mounted Google Chrome 43.0.2357.73-44.0.2403.18 Beta Update on device disk4s2
May 28 09:57:50 MyCOMPUTER.local WindowServer[142]: disable_update_timeout: UI updates were forcibly disabled by application "Dock" for over 1.00 seconds. Server has re-enabled them.
May 28 09:57:50 MyCOMPUTER.local WindowServer[142]: common_reenable_update: UI updates were finally reenabled by application "Dock" after 1.58 seconds (server forcibly re-enabled them after 1.13 seconds)
May 28 09:58:15 MyCOMPUTER.local mds_stores[145]: (Error) SecureStore: Access token 3 changed uid from -1 to 501
May 28 09:58:32 MyCOMPUTER.local launchctl[422]: launchctl: Dubious permissions on file (skipping): /Library/LaunchAgents/com.adobe.AAM.Updater-1.0.plist
May 28 09:58:33 MyCOMPUTER.local distnoted[424]: # distnote server agent absolute time: 208.977299042 civil time: Thu May 28 09:58:32 2015 pid: 424 uid: 89 root: no
May 28 09:58:34 MyCOMPUTER.local com.apple.SecurityServer[15]: Session 100015 created
May 28 09:58:34 MyCOMPUTER.local Adium[377]: BUG in libdispatch client: kevent[EVFILT_READ] delete: "Bad file descriptor" - 0x9
May 28 09:58:35 MyCOMPUTER.local iTunes[379]: failed to create BKAgent: Error Domain=NSCocoaErrorDomain Code=4097 "Couldnt communicate with a helper application."
May 28 09:58:35 MyCOMPUTER.local WindowServer[142]: disable_update_timeout: UI updates were forcibly disabled by application "Finder" for over 1.00 seconds. Server has re-enabled them.
May 28 09:58:35 MyCOMPUTER.local WindowServer[142]: common_reenable_update: UI updates were finally reenabled by application "Finder" after 1.44 seconds (server forcibly re-enabled them after 1.00 seconds)
May 28 09:58:37 MyCOMPUTER.local WindowServer[142]: disable_update_timeout: UI updates were forcibly disabled by application "Finder" for over 1.00 seconds. Server has re-enabled them.
May 28 09:58:38 MyCOMPUTER.local WindowServer[142]: common_reenable_update: UI updates were finally reenabled by application "Finder" after 2.28 seconds (server forcibly re-enabled them after 1.00 seconds)
May 28 09:58:46 MyCOMPUTER.local WindowServer[142]: disable_update_timeout: UI updates were forcibly disabled by application "Finder" for over 1.00 seconds. Server has re-enabled them.
May 28 09:58:47 MyCOMPUTER.local WindowServer[142]: common_reenable_update: UI updates were finally reenabled by application "Finder" after 2.05 seconds (server forcibly re-enabled them after 1.00 seconds)
May 28 09:58:51 MyCOMPUTER.local iTunes[379]: ApplePushService: APSConnection being used without a delegate queue
May 28 09:58:57 MyCOMPUTER.local iTunes[379]: AVF error: AVDLoadAllAccelerators machine not supported