I've got a "long text area" field that I've put on a page (in edit mode) like this:
<apex:form>
<apex:pageBlock title="monkeys" mode="edit">
<apex:inputField value="{!opportunity.JobIdRequestComments__c}"/>
<apex:inputField value="{!opportunity.LostDescription__c}"/>
</apex:pageBlock>
</apex:form>
The second of the two fields shows up just fine, but the first does not appear. Any idea what to look at? I don't see any difference between these fields in the field definitions, and the problem still exists when using the standardController with no extension.
As another test, I created a <apex:inputTextArea> on the same page, and when I put value="{!opportunity.JobIdRequestComments__c}", it doesn't get rendered, but when leaving that out, it does.