Office '10

The following example is a persistent problem.

I'm in a spreadsheet that has text in the various lines of column B.

I notice that some of the cell's text is not displaying correctly. I cursor over a cell that does display correctly and one that does not. The problem is apparent--the correct cells are left aligned (per the paragraph icon at the ribbon) and incorrect cells are center aligned (per the paragraph icon at the ribbon).

I click in the cell that is center aligned and when I attempt to click on the left align paragraph icon the cursor will not move the highlighted center aligned icon. So effectively, while in the cell that is center aligned, you cannot unselect the center icon to choose a different alignment icon.

If I close and reopen the spreadsheet, the problem resolves.

Similarly (actually the primary example of this freezing condition) is attempting to File Save As.

I attempt to mouse to File but the mouse will not go to the File tab. I have to 'x' out of Excel, reopen the file and then I can File Save As.

Any suggestions?

Mark