There’s a bug in Fix System Tray Tooltips Not Displaying in Windows XP where sometimes the system tray tooltips and popup notifications will show up behind the taskbar, or behind other windows.
The way to make everything start working again is to do the following:
- Right click the taskbar, choose properties, and uncheck the checkbox that says “Keep task bar on top of other windows”.
- Click Apply
- Check the checkbox again.
- Click Apply again.
This will temporarily make the system work right again, but you may have to repeat these steps if it happens again.
Note: Neosmart has created a small application that will fix this problem.