I have iPhone 4 on iOS 5.1.1 and when i go to mailboxes, This message has no content. (note the strange date as well, respring fixes but does anyone know what causes?)
Fix This message has no content
I had the same trouble with the mail list which I discovered first because it was the most obvious bug. However, whenever the mail list showed the “no content” lines the task list of miCal was empty, too. So, to me it looks that some database query mechnism seems to be corrupted producing rubbish.
For me respringing did NOT work, I always had to reboot!
I followed jefbenet’s advice that it could be linked to AutoProtect. So I turned it off and I’m looking forward to a positive result. It seems very likely since, now thinking about it.
The problem only occured in home wifi networks and not at my workplace where I did not use AutoProtect