winXP SP3, 32bit

First I created .blend Integrate_Construct1_1 in Blender 2.56 r34281. All is working as expected: the keyed particles moves to the last object (Cube2) and forms it ideally.
Then I found some crashing bug and decided to check it. So I downloaded the latest version 2.57 r36052 (w Lux but I think it's nevermind - the builder tells it's 2.57) to check it properly. I realised that some of that previous bugs (maybe) corrupted the file so I got some cool chaotic triangles in air (not tiny squares I wanted for).
Then I created the test file from the scratch: the new .blend (created in the latest version) now can't produce that fine "reconstruction effect" with Keyed Particles.
What's interesting... That's the fact - the first .blend file (from older version) works fine in this latest version! But nothing helps me to make a good keyed animation from the scratch.

Integrate_Construct1_1 - is the first (good) file
Integrate_Construct2_1 - the second (bad keyed particles) file

BTW... some time ago (before r34281) I saw the same problem... Then I thought that these keyed particles suppose to act like that (to work "not perfect") and I decided to leave this for better times.