Specific to 1) message swiping being enabled 2) Android 4.0 - 4.3 inclusive, but not 2.* or 4.4.
Already got the crash log, going to look at it now.
>> recreate message web view during view recycling to avoid carrying over zoom factor
Yes, this is the cause. Android 4.4 and 4.0-4.3 need a different song and dance here.