This is obviously not the server issue, just need help, maybe someone met this problem.

I have Minecraft for about a two years, but always played in singleplayer, not bothering with skin.
About two months ago I started playing TFC (created a recommended Forge profile in standard launcher) and shortly after it tried multiplayer, a vanilla server and the HappyDiggers TFC. Then I decided to make a skin and made it with Nova Skin web editor. Successfully uploaded to Mojang Minecraft website.
Now when I go to a vanilla singleplayer - I see my new skin by F5.
When in TFC singleplayer or on HappyDiggers - I'm Steve.

I tried to Google - no result. The only weak idea I have left is to use another editor, re-save skin and re-upload.

Have anyone met such an issue? Any advices?