V4.0.467.0, Win XP Pro SP3 etc I started a 'Smart scan' of the whole system. It was running with about 75% cpu in egui.exe (why is the gui so busy?) and about 20-25% in ekrn.exe (I would have expected this to be busiest), and I couldn't get something else done. So I went to the running scan (the window that shows the log of what it is doing) and clicked the Pause button. The status message just under the window pane title changed to say "Waiting to pause scan" and the logged activity stopped - suggesting that it had in fact paused. But the Pause button is now greyed-out, whereas I would have expected it to have changed to 'Resume' so maybe the 'waiting to pause' message means that it's not entirely paused. Meantime I couldn't resume the scan. I came here and looked for other people having the problem but didn't see anything relevant. So eventually I terminated the egui.exe task in task manager, then restarted it. Now the scan correctly shows as paused, and there was a resume button, which I clicked and it's going again.