Combining PDF Form causes fields to disappar, Acrobat to crash when trying to edit combined PDF

Question

I have a 10 page PDF form that I can edit normally.  I combine it using the Combine Files wizard.  The resulting PDF has several fields disappear upon saving, and causes Acrobat to crash every time if I try to edit the form.  I can combine the original PDF form with no other document, and the error still occurs.  I have several similarly named fields, such as Name#1 and Name#2, and it seems that all those fields disappear after going through the Combine Files process.  I can open the resulting PDF, and fill in the remaining fields, but attempting to edit the form causes Acrobat to crash each and every time.
I have used this process before, with no problems, but it fails every time on this form.
This is the error in the Event Viewer: Faulting application Acrobat.exe, version 10.0.0.396, time stamp 0x4cc5ebc0, faulting module AcroForm.api, version 10.0.0.396, time stamp 0x4cc5f5cc, exception code 0xc0000005, fault offset 0x0012d905
This is using Acrobat X Standard and Pro on XP Pro and Vista.
If I open the original PDF, and insert a new PDF as new pages, that works fine.
I updated Acrobat to the latest patch, problem remains.  I don't know how to resolve this.

Answer 1

Did a little more testing and this is what I found. If I use the "Insert from file" feature to combine a cover sheet plus 3 AcroForms (inserting each file one by one), eveyrthing appears to work.  However, if I use the "Combine via Acrobat" feature I run into the issue of fields disappearing once combined.
I shoudl also add that perhaps the issue had something to do with the fact that I initally produced the cover page pdf via Photoshop "save as PDF". Perhaps that contirbutted to the structure issue despite it being a PDF...maybe under the hood things are structured differently.  Who knows.
Just FYI for others: What appears to be working is using the "Insert from file" option vs "Combing via Acrobat". Also, if you are including a non-AcroForm PDF, be sure it a traditional vs. saving as a PDF from Photoshop.
Alot of this may be a fluke, but it seems to fix my issue - for now.