vb.org Archive - View Single Post - User can prevent Admin visitor messaging them?

I have a lurker on my forum who I recently contacted by VM to try and get them posting.. next time I check they've disabled visitor messaging and the message editor doesn't even show for my admin account.

Obviously I went into the User Manager and turned it back on.

But my question is, how are they doing that? Shouldn't it be that even if they want to prevent others from visitor messaging, admins are exempt (like PMs)?

X vBulletin 3.8.12 by vBS Debug Information
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Messages:

X vBulletin 3.8.12 by vBS Debug Information

Page Generation 0.01081 seconds
Memory Usage 1,761KB
Queries Executed 11 (?)

More Information

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(1)SHOWTHREAD_SHOWPOST
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Messages:

X vBulletin 3.8.12 by vBS Debug Information
Page Generation 0.01081 seconds Memory Usage 1,761KB Queries Executed 11 (?)
More Information
Template Usage: (1)SHOWTHREAD_SHOWPOST (1)ad_footer_end (1)ad_footer_start (1)ad_header_end (1)ad_header_logo (1)ad_navbar_below (1)footer (1)gobutton (1)header (1)headinclude (6)option (1)post_thanks_box (1)post_thanks_button (1)post_thanks_javascript (1)post_thanks_navbar_search (1)post_thanks_postbit_info (1)postbit (1)postbit_onlinestatus (1)postbit_wrapper (1)spacer_close (1)spacer_open Phrase Groups Available: global postbit reputationlevel showthread	Included Files: ./showpost.php ./global.php ./includes/init.php ./includes/class_core.php ./includes/config.php ./includes/functions.php ./includes/class_hook.php ./includes/modsystem_functions.php ./includes/functions_bigthree.php ./includes/class_postbit.php ./includes/class_bbcode.php ./includes/functions_reputation.php ./includes/functions_post_thanks.php Hooks Called: init_startup init_startup_session_setup_start init_startup_session_setup_complete cache_permissions fetch_postinfo_query fetch_postinfo fetch_threadinfo_query fetch_threadinfo fetch_foruminfo style_fetch cache_templates global_start parse_templates global_setup_complete showpost_start bbcode_fetch_tags bbcode_create postbit_factory showpost_post postbit_display_start post_thanks_function_post_thanks_off_start post_thanks_function_post_thanks_off_end post_thanks_function_fetch_thanks_start post_thanks_function_fetch_thanks_end post_thanks_function_thanked_already_start post_thanks_function_thanked_already_end fetch_musername postbit_imicons bbcode_parse_start bbcode_parse_complete_precache bbcode_parse_complete postbit_display_complete post_thanks_function_can_thank_this_post_start showpost_complete
Messages: