Oh, my mistake >.< It's 'My Objects' not Objects, my apologies.
But if it still doesn't work, Try these.
1: Go into 'My Objects' and search for the config (.cfg) file of the object that has no texture.
2: Open it up in Notepad
3: Find the Material name (ending in .png or .jpg)
4: Open up the Object in object maker
5: Find where the material name is supposed to be
6: Type in the Material name you saw in Notepad
7: Refresh the Object
Tip: Make a separate group for your objects, don't save them in the default groups.