Unable to view sheet tabs

I'm unable to view sheet tabs nor the horizontal scrollbar. I have verified the options are set to sheet tabs & horiz scrollbar in the options menu. Also, I verified I'm opening the file with the Excel app. Are there anything else I should check ? I would appreciate any help on this since I'm at my wits' end.

Add: It seems as if though my spreadsheet is sized too large for me to see the scrollbars & tabs. The vertical scrollbar top arrow is visible, but not the bottom arrow. If I keep scrolling down, the vertical bar decreases in size and then disappear from view on bottom.

--TorranceChris