Sylvain, thanks for the response.

1/ Yes, I use a single field primary key of type INT with identity set
(ie autonumber).

2/ As you suggest, I've tried entering a dummy Resynch command and it
seemed to overcome the reported problem, though I don't see how I can
enter "a SP
without the right number of parameters" without receiving an error. In
fact, it seems that entering a non-existent, nonsense SP name works
just as well (ie you get an error message). Could you please explain
how I can overcome that.

I tried entering the Resynch command as recommended at . . .

http://msdn.microsoft.com/library/de...ynccommand.asp

It seemed to work sometimes but not always. Certainly not as well
(apart from the error message) as the dummy SP idea.

3/ I had a look at Profiler, but it's pretty arcane - I have no idea
what I'm looking at.

Thanks for your response - maybe we're homing in on the solution.