Problems with opening a minimzed file
 

I have 3 files open in the cascading Excel tab on the task bar, but when I
click on the 3rd file, it doesn't appear in Excel. When I click on the other
2 files, they appear, but the 3rd file doesn't appear anywhere, but it is
listed in the tab of the cascading Excel tab on the task bar. This has
happened 3 or 4 times over past 2 weeks and I first I thought I was going
crazy....but it is happening.