Ahh, things are getting clearer!
PATH=C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program Files\ATI Technologies\ATI Control Panel;C:\Program Files\QuickTime\QTSystem\
AND I've got a c:\cals.txt file, which looks as if it includes 11 calendars, ie the same as the number of calendar files I can see in Lightning!
Also, does synchronisation work if you choose only read/write calendars in MPE?
Looking in the cals.txt file, all 11 calendars have got RW in the row (eg UK Holidays http://www.google.com/calendar/ical/uk% ... /basic.ics RW #CC66CC) - does that mean anything?