Hi all,

I'm running Win 7 on my work machine and since Monday I've noticed a black window (probably a command-line app) flashing up for a fraction of a second every hour (technically it seems to be about every 60:00:00.5 as it's drifted by ~20 seconds over the last couple of days). I don't see anything relevant in Task Scheduler and Google isn't finding much of use - one suggestion was to check "BITS" via PowerShell and there were four failed jobs in there, but deleting them had no effect. The window disappears so quickly that I don't get a chance to read its title.

Interestingly a friend has reported the same issue to me, apparently also starting a few days ago. Has anyone else run into this? It looks like it could be a side effect of a Windows update (KB4019990?).

Any suggestions on what could be causing this?