Why does iCal sync via dotMac suddenly fail with Tiger

I've read about the Leopard and Tiger-to-Leopard syncing issues with iCal, but I have an issue that is just with Tiger (10.4.11). I have two machines running the same version of MacOS (one Intel, one PowerPC) in different countries, and a live dotMac subscription. I have a small collection of calendars which are set to auto-publish after each change. This system has worked fine for a long time, and it enables me to use the same calendar in both my main locations.
Last Saturday, 8th March, I shut down one of these machines (in France) and moved to the other one (in England). I then tried to sync the English machine, and it did do an update of my calendars, but it turned out (from the dotMac 'advanced' pane in System Preferences) that dotMac sees the last sync for the French machine as being on 13 February, whereas it was in use every day up to 8 March. Something must have turned off the auto-publish feature on my French machine - but what could that be? I see that the dotMac Sync engine (whatever that is) was last updated on 9 March - this is probably when I first tried to sync the English machine.
Can anyone suggest what went wrong? I have not consciously changed any parameters for iCal or dotMac for a long time.

Hi - I am the original poster on this topic. I have now moved my UK machine to France, and it's sitting in the same room as my other Mac. As before, I have a small set of calendars (only one is relevant) and I am running the same version of iCal on each machine sync'd via dotMac. Let's call the machines A and B,
A few hours ago, I added an event on machine A. I then used the Sync feature of dotMac (accessed via System Preferences) to make sure that this machine was sync'd with dotMac. The date and time of this was confirmed by the 'advanced' info in the System Prefs DotMac screen. I then used the "show Calendar on dotMac" feature for the relevant calendar, and I saw my new event available there.
I then went to machine B and went through the same Sync sequence, but my new event didn't show up. That was some hours ago and it still isn't present. If I do "show Calendar on dotMac" on machine B, I see machine B's version of the calendar, the one without the new event!
The URL for the B version of the calendar is
http://ical.mac.com/WebObjects/iCal.woa/wa/default?d=25&u=livfoss&v=0&y=2008&m=4 &n=Raissac.ics
and for A it's
http://ical.mac.com/WebObjects/iCal.woa/wa/default?u=livfoss&n=Raissac.ics
Clearly there are differences, but I have no idea what they mean.
What do I have to do to get the most up-to-date version of my calendar show up in iCal on machine B? I am completely stumped.

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