OSX Messages app - not showing all messages?

[themoffster]

I have an iPhone 4S and a 2011 iMac running a fully updated ML.
In the messages app, I have a lot of contacts that I have been texting on my phone - however, only some of the iMessages we've sent (note, not text messages) appear.
Is there a general rule of thumb about which messages show as I can't see a pattern to why some appear and others don't?

If I look on my iPhone i see all iMessages in our conversation, but the iMac only has a subset of these messages for some reason.

 

[johnnnw]

I'm having this problem as well.

I'm beginning to learn its just extremely flakey.

Sometimes it will just stop receiving all messages as well, I don't know.

And yes this is iMessages, not text messages, I know texts don't work of course.

 

[charliex5]

Yeah, extremely flaky. For me, iMessages often don't show up or they arrive later and out of order. Quite frustrating. I was supposed to pick my wife up once and was on the computer thinking I would get her text that way. Nope.