I havent found mention of this anywhere, so I feel like I should describe this problem.
I've been using Conversation on my E71-2 (symbian s60v3) ever since the semi-recent update I found on a blog in January and occasionally messages will hang. This problem has been increasing in frequency, (as has the instability of my E71 overall, but I dont know if the two are causally related).
I cannot produce the error at will, but what happens is that my phone will stop receiving any and all messages while Conversation is open. I lost a couple thousand dollars in a recent business transaction because of this, and I did not even know it -- no message alerts sounded (phone was on normal profile), and in fact, none of 14 SMS's came through until I received a call asking why I had not replied. After I hung up, I exited out of Conversation with the End Key, and only then did all of the messages come through, and I could access them in either Conversation or the normal method. They also had the correct timestamp of when they should have been "received," from 2:14pm to 6:39pm. Messages were coming from a different network and from the same network.
This has happened a few times since I installed it, but never for this long, or with this many messages. When it has happened before, two or three messages pile up before Conversation crashes, thereby resulting in the messages coming through. Furthermore, Conversation used to crash the phone roughly once a month, but for the last 6 weeks, its been about once a week -- my messaging habits have not changed. I had not changed versions or anything of the sort during this time.
Possibly related, the texts, borders, images, fonts, and buttons in Conversation sometimes render poorly and are illegible and strangely colored (I use only the default theme), and this requires a restart of the phone. I don't know how to duplicate this either, its simply random.
I was running the following firmware until this glitch, as new firmware was only very recently released for my product code:
v100.07.76
8-6-2008
rm-357