I explained it to the help-desk at the time I closed the bug report - which was for V1.8.2.1.  The fact that I experienced the same problem with 3 was slightly disappointing but I was not altogether surprised.  
It may be a bizarre quirk of my system,  but as it's a bog-standard 'out of the box' Acer M3100-GETZ (bought in France so with French version of MS Vista)  I suspect that there will be others put together in the same way and they may possibly have the same problem.  Unless, of course, it's something I've added to the machine myself which is causing the problem, but adding the occasional bit of software is as far as I go with the thing.