A few hours after I wrote the below…
FamilySearch Indexing support replied to my eMail(s) to them with this link
which covers both Mac OS X 10.4 and Mac OS X 10.5.
I noted with some excitement last evening that FamilySearch Indexing had a project underway with a New Zealand flavour to it – “New Zealand—Passenger Lists, 1871–1915”, so I thought this was the incentive I needed to get back to indexing – something I hadn’t done in quite a few months. But alas I couldn’t get the FamilySearchIdexing application to start up – no matter what I tried it generated an error “Unable to start the Application”.
Some Googling led me to this page https://help.familysearch.org/publishing/301/103757_f.SAL_Public.html which provided the hint as to where to look, but unfortunately those directions aren’t directly applicable to Mac OS X 10.5.7 which I’m running.
So this page lists what I did to fix this problem. NOTE – these instructions apply to Mac OS X 10.5.x
Go to your Macintosh HD ——> Applications ——> Utilities folder and find the icon “Java Preferences”. Double click that to open it, and then click on the Network tab
Now click on the “View Cache Files…” button at lower right.
Find any items in this list that show “FamilySearch Indexing…” in the Application column and delete them – highlight them and click the Red X at the top of the screen, or right click on them and choose Delete.
Now click on the pop up menu at the top of that screen that says “Applications” and choose “Resources”
Click the “URL” heading to sort all the entries by their URL – this puts all the items from http://www.familysearchindexing.org/ together in the list. Select all of them by clicking on the first one, holding down the shift key and clicking on the last one, and delete all of these files. Close the Cache Files window and then the Java Preferences window.
Go to http://familysearchindexing.org/ and click on “Start Indexing” at lower right. After the application is downloaded – several minutes on a fast DSL or cable connection – and the programme should start up.
Good Luck, and Happy Indexing.