Comment 1 for bug 613209

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Alex Harrington (alexharrington) wrote : Re: Switching to a powerpoint causes a "Navigation Canceled" page

Someone else reported something similar to this but hasn't come back with any information on it and Dan and I have been unable to reproduce it - their report concerned a video.

What's happening is for some reason the client thinks it has that file downloaded already - otherwise it wouldn't attempt to load that layout at all.

Are you certain this client has never downloaded that file before and then you deleted it from the local library? The client keeps a cache of which files it's downloaded and their checksums to speed up startup and prevent continual checksumming of things like large video files. If the client sees that it's downloaded that presentation successfully once, then it will always expect it to be there. If you then delete that file from under the client, the next time it sees a layout with that media item in, it will consult it's cache and see that it has downloaded the file and so it should already be in the library.

Is that possible in your case?

Alex