What is the source of "There are pending changes to your account." message on Admin pages?

Got an interesting one here.

One of my sub-sites on a multisite install displays the following message on all admin pages:

<div class="updated"><p><strong>There are pending changes to your account.
This message will disappear once these pending changes are completed.</strong></p></div>
<div class="wrap">

Has anyone seen this one before and /or know what might be generating it?