ID:294396
 
BYOND Build Number:4.55 I believe (Latest Version
Problem Description:
I can't seem to insert transparent turfs into the game. For instance if I use a tile that's not complete (With blank spots for transparency) like edges. Dream Maker will fill that spot with a black space. Same happens to .png files

Steps to Reproduce Problem:Make a png file with transparency (like a sprite sheet), set the icon and map it.
Version 455.1046 is certainly not to be considered recent, given that the latest stable public release at this point in time is 479.1086. I'd recommend updating now, for the sake of performance, stability and security.

As for your problem, it is more of a developer problem, so you'd have had a faster time searching the developer forum for previous such issues, where you'd have found plenty of replies. The behaviour you describe is the result if the introduction of isometric maps. You can set back to the old behaviour in the Map Editor, if you check 'Options'->'Click behaviour'. Please note that the effect you describe is just a visual one though and there is only ever one turf per tile. Every previously placed turf is deleted and it's appearance added as underlay to the new one.
In response to Schnitzelnagler
Yeah, I meant 4.79.1086, thank you for your answear =)