Mine carts glitch, shaking violently (DUPLICATE, can't delete?)

UPDATE: This is a duplicate but I don't seem to see a delete function. 🙂

I do believe I just saw another post about this. I did provide video example:

Again, thank you.

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This glitch makes it unbearable to watch the cart while it's moving, which to me is definitely worth a notice if you would be so kind. Carts used to look so smooth and cool, now they're as likely to cause a seizure as provide an enjoyable ride on a roller coaster, or to the next town. It's been doing this precisely since the latest update (1.4.5) was released.

Here is my 30 seconds of evidence: http://www.youtube.com/watch?v=oS_tEAEfW8c

Thank you for your good work!