I've been experiencing a similar problem to this lately. At times, I'll notice that I'm not getting any sms replies. After restarting the phone, I'll start receiving a number of smses that i should have received much earlier . The first time this happened to me, an icon appeared on the bar above and when i clicked it, it said the phone had insufficient memory. Correct me if i'm wrong, but i think i read somewhere that the amount of smses that the phone can store is limited only by the phone memory, and i had close to 90mb of free space in my phone memory at that time. Had about 1300+ smses in my inbox and 1200+ in my sent messages when that happened.

So after deleting a few hundred smses, the problem seemed solved. But it occasionally happens again and this is kinda irritating. The not-enough-memory icon never appeared again though.

Never had a problem so far with the send button though.

Anyone else experiencing this?

I've been having that exact same problem!! Happens to me off and on. One day it'll be like that, then it'll be ok for the next few days and suddenly it'll start acting like that all over again. Real annoying!