I just helped a friend with a “GMail” problem. He couldn’t close the “tasks” window. I found that it might be a somewhat common problem — I found a Google Groups post regarding the problem (Google Groups: Help! Can’t close Tasks).
Here’s what it looks like with the task Window open where you can’t see the close button:
The issue is that the resolution is too small to display the title bar of the tasks. Therefore, you can’t click the close button.
I read that in some cases it was the screen resolution. In my case, it was because the window was zoomed in. That is a feature of the browser rather than GMail itself. In this case, I am using the Google Chrome browser. In the view menu, you’ll see the options.
The “Zoom In” will make things larger so that you can read things better. It might distort the page a little, which is what it is doing here. The “Zoom Out” option shrinks it back so that you can see more on the page. The “Actual Size” resets things back to normal.
I believe most of the different browsers support this feature. You will find the option in different places, but I think they use the same keyboard shortcuts. If you hold the Ctrl key down, the plus ( + ) makes things bigger, and minus ( – ) shrinks it back. Holding the Ctrl key and pressing zero ( 0 ) resets things back to normal.
So, in this case, hitting Ctrl + 0 fixes it so we can see the close button:
Here are some of the other browsers’ documentation for zooming: