I am confounded by this issue. I am able to display a custom SObject checkbox in an inline VF component on the Contact page layout. However, with the same code (this time std controller = Account), I am unable to display the checkbox on the Account page layout even though I can drag and drop the inline VF component onto the Account page.

Here is my VF page code:

<apex:page standardController="Account">
 <apex:form >
  <apex:pageBlock id="theBlock">
<!-- first row -->
    <apex:pageBlockTable value="{!Account}" var="a"> 

        <apex:column headerValue="Fund/Status">
            <apex:outputText >
                <b>EJF</b>
            </apex:outputText>
          
        </apex:column>
          <apex:column headerValue="On Approved List">
              <apex:inputField value="{!a.EJF_Approved__c}"/> 
          </apex:column>

    </apex:pageBlockTable>
<!-- end of first row -->
  </apex:pageBlock>
 </apex:form>    
</apex:page>

EJF_Approved is the name of the custom checkbox and is in the list of custom fields under Account fields:

On the accounts page, this is what I see - no checkbox:

There are no errors. Finally, the Account tab is renamed to Investor. I don't think that's the spoiler but just to round up all possibly pertinent information.

It seems like I'm getting something fundamentally wrong here but don't quite see. Please help.