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I don't know if a new thread should be started, but for me the culprit is the kde5 wallet integration.
Disabeling it yields a startable thunderbird again.
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the new package 45.1.0-2 has fixed the problem for me!
+1
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I didn't have Lightning but only the ImportExportTools add-on and the crash kept happening after disabling it. So, I downgraded Thunderbird.
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I downgraded thunderbird as well. (and had to downgrad hunspell as well since the current version does not work with thunderbird...)
I also opened a ticket at bugzilla
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