Locking the taskbar has nothing to do with hiding Notification Icons.
Is the setting for each Icon changing from Always Hide to one of the other two settings?
Is the Hide Inactive Icons box getting unchecked?
Are you running any kind of a cleaning tool, like CCleaner, WindowWasher, or worst of all a registry cleaner?
Microsoft MVP - Windows Expert - Consumer
Of course I know all the answers; I just don't always match the answers to the right questions.
Rated R for Violence -- When your PC flies through a window, that's violent, right?