I used TimeDelta like you guys suggested. I'm having new problems now, When selecting blocks and moving them sometimes they will float. I think it's the collisions, they only float when another block is on top of them.
.cap file
http://www.mediafire.com/?mmyzmmnvnfi
Has nothing to do with Timedelta though, as this was a problem with nowon's example to begin with. Also, looking at your cap, it seems a bit needlessly complicated. I wish you had actually installed a recent Construct version and looked into my example as well.
Anyway, here is it again saved in an older version. You should be able to open it in 0.99.62.
http://dl.dropbox.com/u/2306601/cubebust3_94.cap
If you follow that approach there should be no floating. Cheers.