1) Reboot computer if you have not already - if something went bad to cause it to not display, a fresh computer bootup will solve most all problems.
2) What I see some people do is make the taskbar smaller. Put your mouse at the bottom of the screen - VERY bottom, does it change from a pointer to a up/down 2 arrow? If so, then the taskbar may have been minimized - click while you see the double arrow and drag up a little bit to "expand" the task bar back to the regular size.
(hide) If you don't want other users to know what you are doing you can change into cloak mode in Settings (paying members only). (pauloaguia) (show all tips)