XMP data - when is it written to folders

I assume that XMP data is written, as needed to the LR data base.
However, if I have selected to "Automatically write changes to XMP", when are those changes written? Are they written as changes are made or only when LR is closed....or at some other time.
This is important if I plan to go to PS to work a file or batch process a number of files.
EDIT: I just had a specific instance where I cropped an image in LR, and it has not shown up in either CS2 or CS3 ACR (latest levels on both, WIN/XP SP2)
RE-EDIT: OK...OK....I missed the '!' with the message. Apparently it trier and had a problem. Can you add a auto-rewrite function....or some higher level notice of a XMP write problem which will point out the specific files having a problem....otherwise one would not know there was a problem (as I didn't) and/or have to go hunt for it.
Thanks for a great product. I was not sure where it fit with the work you were doing with CS3, but so far I am impressed.
John

For posterity, here is the answer, answered on stack overflow:
http://stackoverflow.com/questions/27861080/when-is-it-safe-to-release-an-imfsample-and-its-data/27862288#27862288
No, it's not necessary to put on an asynchronous callback to free the memory. 

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    Is there a way to have all file types to utilise sidecars rather that modifying original file?

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