Answered
Using Acrobat X Pro on Windows XP SP3 with .5 Gb memory. When attempting to move a page from one location to another the page goes to another location. For example if page 17 is drag and dropped to after page 2, it will show up after page 10 or some other unpredictable location. Moreover the same behavior happens when attempting to insert a file after page 2. PDF Optimizer has been used on the 600 page document.
I'm a newbie, please request further info if needed.
You said you have tried inserting a file after page 2. If so, you should submit a bug report (provided you have updated to Acrobat Pro 10.1.1)
Feature Request / Bug Report Form
https://www.adobe.com/cfusion/mmform/index.cfm?name=wishform
On a side note, you have 500 K of memory? While that will "technically" work, I highly recommend you get to 1 or 2 GB (at least). RAM is pretty cheap today, and it will make a WORLD of difference (in general, not related to this issue).
Kelly McCathran
Adobe Community Expert
Certified Technical Trainer+