So it seems after a few testing and trying an older version of the file in r195, the problem persists. So it's not about the version.
Can you be more specific? what's wrong with my pc?
Some testing results: I preview the file, sometimes it goes red loading bar, I click preview again without changing anything, sometimes the preview loads fine. This really makes me dumbfounded as I literally don't need to change anything to make preview sometimes work, sometimes it doesn't. It's purely random???