My emacs version is GNU Emacs 24.3.1 (i386-mingw-nt6.1.7601) of 2013-03-18 on MARVIN.
If I start emacs with '-q' option, I'll use the built-in org-mode 7.9.3f, and for following text
* Level 1
** Level 2
Some text for level2.
if I press M-RET at the end of the last line, I'll get a new heading in a new line.
* Level 1
** Level 2
Some text for level2.
**
However, in org mode 8.0.3(from ELPA), it makes the last line a new heading instead of inserting a new one.
* Level 1
** Level 2
** Some text for level2.
It's very intrusive and I'm wondering whether it's a bug or something. Could you tell me how to get M-RET behave like version 7.9.3f?