Try AdminCP > Settings > Options > Forum Sidebar and Block Options
^ That is the area where you enable/disable the sidebar and set it to left or right display (read the bottom setting, leave it ALONE i.e. do not disable cache).
Now of it does not show after that... then do as Lynne noted above and check your blocks, should be one if not more listed - if not then create some new sidebar blocks and afterwords reload the block types then clear block cache and they will show.
*If you recently were adding in plugins OR CSS code to any templates, did you perhaps add in code that hides the sidebar OR did you collapse the sidebar and simply need to click the button w/ the arrows to make it show again? See Attached.
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