Version 1.5 can't find textures

I have a game I did using 1.4 I got version 1.5 and dropped the exe file in the root directory and it crashes because it can't find the textures. What changed in 1.5 ? I run the 1.4 engine and it's working fine so main.cs points to the proper place.

example:
Could not locate texture: Game/client/ui/hudfill.png