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Every time that I (or my pack admin) toggles the option for my account for “Messaging Opt-out” it returns the message " Whoops! We encountered an error trying to process your request. Our webmaster has been notified and will fix it ASAP!"
I have been trying for a few weeks with the same result.
I don’t believe I ever toggled this setting and I am missing messages from our Den and Pack now.
When a fix is released, a notice will be posted in the Scoutbook Change Log. I cannot predict when this will be fixed, all I can say is I did tell the developers it should be done ASAP.