Mac Help feature blank box

The Mac Help function often comes up totally blank, or if it has hyperlinks, they do not work.
This happens at anytime, seemingly unrelated to anything else.
What to do?
Thank you for your consideration.

Hi Francis,
(in addition to R C-R's excellent answer)
Yes, you can rename the corrupted caches folder, or simply get rid of it by dragging it to the Trash.
If deleting the Home/Library/Caches/com.apple.helpui folder still doesn't fix Mac Help,
try then deleting those preference files:
Home/Library/Preferences/com.apple.helpviewer.plist
and
Home/Library/Preferences/com.apple.help.plist
A common and harmless problem, most probably related to Mac Help's hyper-sensitivity to erratic internet connection while updating its contents.
Axl

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