Hi
Your mp4 downloaded OK and loaded OK into VP 8.77
Windows Vista Home Premium 32-bit SP2
Intel Core 2 Duo CPU E4500@ 2.2GHz, 2.0 GB RAM
NVIDEA GeForce GT 730.
(...so nothing super.)
From an empty cache the project loaded to timeline (eventually) with no particular hitches. A 90 min 1920 x 1080 clip takes a bit of time to load first time around. (This took around 45 mins to cache fully (around 30 seconds /min...CPU working around 91 -95%))
Once in the cache the project re-loaded into a re-opened VP from scratch in a second. (almost immediately)
Project loaded into VP from a vpj file in about a couple of seconds.
This played fine in VP 8.77 in an expanded sequence preview screen. There were no glitches or "building Preview" messages even when the timeline was jumped from place to place with the red cursor line in sequence preview.
The project exported as a 1920 x 1080 mp4 HD Default quality @38fps, and did this in 2mins 39 seconds.
Can't see anything wrong with this mp4.
Nat