Cannot drag items onto taskbar to maximise windows

I'm having a really strange problem lately, whereby I can't drag items to the taskbar to open the corresponding Window (e.g. to drag an item from the Desktop into Windows Explorer).

What's been happening for me the last couple of weeks is that nothing happens at all. The taskbar entry for the application I'm hovering over is darkened/highlighted, but the window itself never maximizes..

Any ideas on what could be causing this?

 

Are you talking about the 'Quick Launch' part of the task bar?? Sorry slightly confused here.

 

No. Ordinarily in Windows, when you drag a file/icon/whatever on to any minimized application, that application will maximize.
For example, if I had an mp3 file on the desktop, and I have Windows Explorer open but minimized, I should be able to drag my MP3 file from the desktop to where it says "Windows Explorer," in the task bar (the same are I'd click to maximise it) and it should automatically maximize, allowing you to drag the MP3 into the window.

 

Ah ha! I see now. You learn something new everyday eh?

I'm sorry but I do not know why you cannot do it. Does it work on a different user profile?