Pixel offset is acting strangely for clients connecting using BYOND 488 to a BYOND 489 server. In NEStalgia every player and NPC has a pixel_y offset of 8, just defined like this:
mob
pixel_y = 8
I've been compiling using BYOND 489 for a couple weeks now, but I didn't upgrade the Dream Daemons for NEStalgia servers to 489 until yesterday. Shortly afterwards, players started seeing NPCs and players with no pixel offset at all. The visual glitch was limited to players using 488 or lower to connect, and the pixel_y offset seems to fix itself randomly (usually when the player moves or teleports). Screenshots and details can be found in this thread: http://silkgames.com/forum/viewtopic.php?f=35&t=6545
Having the client upgrade to BYOND 489 fixes the issue, but I figured that you should be aware of it.