Terribly annoying and obvious bug that quickly undermines my trust in iPad/iOS reliability. I've just tried to send a message, lost it 4 times in a row. Killing the mail app didn't help, but restarting iOS did. Checking the list of Diagnostics & usage data, I can see 4 corresponding crashes of the email app, named "MobileMail_....-iPad.crash". All of them contain crash description like this. Apple gets this automatically by millions of iOS users, so they can fix it easily, if they want. Waiting impatiently for that iOS update!
Incident Identifier: D480A33E-3EC6-48BE-A6D5-63531452D800
CrashReporter Key: 23c71248c3e402a5f8c53298973d13c6869d6eb6
Hardware Model: iPad3,1
Process: MobileMail [106]
Path: /var/mobile/Applications/86673C26-7D82-4B7F-974B-1216ED42A248/MobileMail.app/Mo bileMail
Identifier: com.apple.mobilemail
Version: 53 (1.0.0)
Code Type: ARM (Native)
Parent Process: launchd [1]
Date/Time: 2014-01-04 19:55:27.067 +0100
OS Version: iOS 7.0.4 (11B554a)
Report Version: 104
Exception Type: 00000020
Exception Codes: 0x000000001baddea1
Highlighted Thread: 11
Application Specific Information:
Exception raised during monitored invocation of deliverMessage, exception: *** -[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array