Fixed a handful of little glitches (occasional spurious vectors, enemies on the spherical map having an 'international date line' like Mutants in Defender (which could actually be useful to the player, as it is in Defender, but which is actually just a bit sloppy)), and faulty collisions around the international date line (which no longer occur as it has gone away). Also things could collide repeatedly in a shower of vector sparks, which looked cool but shouldn't have been happening.