[SyncEvolution] Changes in calendar description not syncing

I changed the description field on an event on my Nokia E63 by deleting the latter half of the description. After syncing, I noticed that the change hadn't propagated to the server. I'm running Darwin Calender Server under Ubuntu 10.04 and Evolution has this as its main calendar. I don't know if this is relevant, but thought I'd mention it. Looking at the logfile, it seems that the changed entry was detected, but nothing was done about it. I think that this has happened before, though previously I would have put it down to intending to change something and then forgetting to do it (happens at my age :) ). This doesn't seem to be consistent. I deleted some words from the middle of a description (on the phone) and it propagated successfully. Changes done on the server seem to propagate successfully.