After application language change UI is reset
Go to the Preferences. Change the application language to a different one (use "Ask at startup").
Restart the Acrobat.
Voila. All of your icons in the taskabars are gone, whatever you set is lost.
Reset the language back to the one you started with a hope everything is going to be there back as soon as you revert the language to original one.
You restart but there is no hope. Your taskbars has been reset for good. Happy arranging of the taskbars again!
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