Descriptive Problem Summary:

On BYOND 507.1275 it seems that calling flick() or modifying any icon properties (most noticeably pixel x/y) of an item when it is not moving will not properly update it on the actual map display. A picture is worth a thousand words, and a gif is worth whoa maybe billions:

[Gif]

The projectile is actually moving via pixel projection, but instead, the pixel x/y values are only updated when the projection code actually modified the projectile's location. An atom will not display its flick() animation unless the atom's location changes, as well.

I'll admit it's kind of hard to see in that gif, but that's the best example I can show.