It seems that Option Value Manager has some bugs.
"Copy to ALL Products where Option Name and Value" and other functions don't work.
I copied options_values_manager.php from zen cart v1.5.5, then it works.
I checked some files and find a Typo, but still I can't make them work...
This is the Typo,
zen-cart-v1.5.6a-01042019/admin/options_values_manager.php
Line262
if ($check_previous->RecorCount() < 1) {
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