I have installed the XML parser 4.0 SP2 and rebooted, to no effect.
Unlike some others on this forum, our log files are a mere 27MB or so, but the problem persists after having melted away (thus my relative inattention to the suggested solution). I *hope* it will disappear again as suddenly as it came, but then, it will prbably return again, too.
We have VBE for Windows 9.1 4691 with SP2, on Win2K3.