You might want to look here
HTML "Round-tripping" to repair corruption
http://www.rdpslides.com/pptfaq/FAQ00526.htm
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Michael Koerner [MS PPT MVP]
| Michael Koerner wrote:
| > It should be the other way around according to the help file see below.
| >
| > To retain the slides' original formatting, click the Paste Options
button,
| > which appears under the slides you pasted, and on the button menu, click
| > Keep Source Formatting.
| > If you decide that you want the current design template styles to apply,
| > click Use Design template formatting (this is the default).
| >
| > You also might want to look at the Trouble Shooting animations in the
help
| > file depending on how the animations were put in could also have a
bearing
| > on that they do not run when moved.
| >
|
| Yes, I know - it is backwards! All these presentations were created
| using the same template, but there is a lot of custom work within each
| file and sometimes, special backgrounds are applied from
| Photoshop-created .jpg files. So, in reality, clicking "Use Design
| Template Formatting" should not really change anything between the two
| files - right? And that is what I have to click to retain the simple
| animation.
|
| I have narrowed this down to a corruption of the first file into which I
| am trying to import the second presentation. If I merge Presentation #2
| with any other Presentation file, it works correctly and follows the
| proper formatting of "Keep Source Formatting," keeping the animations,
| as it should. So, some setting (?) in the first file is corrupt or maybe
| theproblem is in the Masters and the client has done something to alter
| the template? This would maybe make sense.
|
| You've been very patient and without seeing the actual problem/glitch, I
| know it's hard to diagnose. Stepping through it this way may have helped
| me pinpoint the culprit. Do you know of anything I could check in that
| first file or a way to re-save it so that the other files could be
| merged correctly?
|
| Many thanks,
| Melon