This has happened before, but IE 10 appears to be stopping the line return in posts. It was fixed before in an earlier situation, does anyone know what setting it might be? There were supposed to be 3 paragraphs in this post. Thanks
Here are some official issues being worked on for IE10:
Pressing Enter to create linebreaks do not work in WYSIWYG on IE10 (PP3)
Facebook publisher doesn't work properly on IE10
IE only spell check button needs to go for IE10
Improve out of the box experience for vBulletin
This effects all vBulletin 4 forums and not just these forums. This problem is definitely on a "major" priority list for a fix.
If you cannot run Chrome or Firefox, I suggest trying the official Microsoft forums as well if this problem annoys you that much. I would recommend running an alternate browser to have uninterrupted interactivity with all websites if you plan on running the Windows 8 Consumer Preview for a long duration or as a primary operating system that you refer to.