Good !

More generally, running the following Applescript should normally track down the cache location.

[CODE]set strPath to GetCachePath()
display dialog strPath
set the clipboard to strPath

on GetCachePath()
set strDefaultFolder to "~/Library/Caches/com.omnigroup.OmniFocus"
set strAppStoreFolder to "~/Library/Caches/com.omnigroup.OmniFocus.MacAppStore"
set strDBName to "OmniFocusDatabase2"

set strCacheFolder to strDefaultFolder
if (do shell script ("test -d " & strCacheFolder & "; echo $?")) ≠ "0" then
set strCacheFolder to strAppStoreFolder
if (do shell script ("test -d " & strCacheFolder & "; echo $?")) ≠ "0" then return ""
end if

return strCacheFolder & "/" & strDBName
end GetCachePath[/CODE]

[QUOTE=kagey;113037]Looks like OmniFocus trashed its own cache!
I just reopened it and no error message, and now the Folder has appeared on cache.
Thankyou:-)[/QUOTE]

Ditto. Self-healing. Bravo!

This worked for me, too. I did have to force quit it in order to quit, but it all looks good now.