I am have two issues for customizing the list forms in sharepoint designer:

1)
I was trying to create a new edit form (aspx) for one of my lists in the
sharepoint. For some lists, it works fine. But for some lists, I got error
message such as "Could not save the list changes to the server." when trying to
create a new edit form.


2)
I was trying to modify an existing edit form of the a list in the sharepoint.
When I open the editForm.aspx in sharepoint designer, there
was something looked like:

<WebPartPages:ListFormWebPart runat="server" __MarkupType="xmlmarkup"
WebPart="true" __WebPartId="{C34AA522-0025-44C7-91AD-FD56E89F8B6A}" >
.......
</ZoneTemplate></WebPartPages:WebPartZone>

and in the design view, there are only three columns which is very different
from what is showing in the edit form in the sharepoint application. How should
I modify the edit form page?



PS: I am using sharepoint 2010 and all the list definition and content types are
customized.