I thought I would start a thread for Mountain Lion issues or oddities we may want to share with others...
I've uncovered two thus far, so feel free to share any thoughts or insights on either one.
I'm going to post two messages rather than cramming both events into a single message, because I'm including one or more exhibits with posts, and I don't want to get the messages to get too cluttered.
The first issue happens when I send an iMessage to myself, from my iMac to my iPhone, and I choose my own phone number instead of my Apple ID as the recipient.
I'm already aware that when you send an iMessage from a Mac to an iPhone, your "caller ID" is your Apple ID and not your phone number. The Mac has no idea what your phone number is, and currently there's no way to change that. This means you will end up creating two separate threads on the recipient's iPhone if the recipient doesn't have both your phone number and Apple ID linked to your contact card on his or her phone. This in and of itself is an issue which I hope gets improved upon.
But when I send the iMessage to myself, it indeed creates two threads on my iPhone immediately (even though I have both my phone number and Apple ID linked to my own contact card), but one of the threads is completely blank. I would expect one thread to be created with the "sent" iMessage (from my Apple ID) and a separate thread with the same content as the "received" message (addressed to my phone number).
Exhibit A - Messages.app on my Mac, showing the iMessage I sent to my phone number. You may ignore the first line ("test").

Exhibit B - The Messages screen on my iPhone, with both threads created as a result of the action depicted in Exhibit A:

Exhibit C - Tapping on the first message listed in the Messages screen reveals the text I sent, and this is obviously the "sent" message (notice the delivery receipt), which is mirrored on my iPhone per the expected behavior:

Exhibit D - Tapping on the second message listed in the Messages screen revels a blank message, when in fact, it should reveal the text I sent (the "received" version of it).

Any ideas?
I've uncovered two thus far, so feel free to share any thoughts or insights on either one.
I'm going to post two messages rather than cramming both events into a single message, because I'm including one or more exhibits with posts, and I don't want to get the messages to get too cluttered.
The first issue happens when I send an iMessage to myself, from my iMac to my iPhone, and I choose my own phone number instead of my Apple ID as the recipient.
I'm already aware that when you send an iMessage from a Mac to an iPhone, your "caller ID" is your Apple ID and not your phone number. The Mac has no idea what your phone number is, and currently there's no way to change that. This means you will end up creating two separate threads on the recipient's iPhone if the recipient doesn't have both your phone number and Apple ID linked to your contact card on his or her phone. This in and of itself is an issue which I hope gets improved upon.
But when I send the iMessage to myself, it indeed creates two threads on my iPhone immediately (even though I have both my phone number and Apple ID linked to my own contact card), but one of the threads is completely blank. I would expect one thread to be created with the "sent" iMessage (from my Apple ID) and a separate thread with the same content as the "received" message (addressed to my phone number).
Exhibit A - Messages.app on my Mac, showing the iMessage I sent to my phone number. You may ignore the first line ("test").

Exhibit B - The Messages screen on my iPhone, with both threads created as a result of the action depicted in Exhibit A:

Exhibit C - Tapping on the first message listed in the Messages screen reveals the text I sent, and this is obviously the "sent" message (notice the delivery receipt), which is mirrored on my iPhone per the expected behavior:

Exhibit D - Tapping on the second message listed in the Messages screen revels a blank message, when in fact, it should reveal the text I sent (the "received" version of it).

Any ideas?