At the risk of adding little more than a me too... I too find that Icedove 4.5 just closes inexplicably several times an hour. I've struggled to find any particular way I can trigger it to happen, but without success. Generally one click on an e-mail to read it, and Icedove just shuts down. After re-starting, the same e-mail can be read without difficulty.
Perhaps however these reports should be switched to a separate ticket, since they more than likely relate to a completely different problem. John
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