vim crashes when saving buffer

Hi,

I'm using vim (version 7.3) under X11 and Mac OS X 10.7.5. Often, when I'm editing two files in split windows, saving one of them (i.e. a simple :w) causes vim to crash with the following error messages:
--
Vim: Caught deadly signal SEGV
Vim: preserving files...

Vim: Finished.

Segmentation fault
---
This usually, but not exclusively, happens when both buffers have changes that have not been saved to the corresponding file.

Is this a known bug? Is there a patch or setup to avoid it?

Thank you in advance for any help,

Jomar

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