well ya .. i have the similar experience ..

a cousin wanted to open a new shop and asked me to design a logo for him . After i designed the logo and wanted to colect payment . But then he want to change the whole concept of it, TOTALY NOT THE SAME as he saying.

After i change as he say, and wish to colect some deposit. But the same word came out "dun be greedy" .... and he ask me to change again. This time is not the design, but is the name of the shop. ( My god, you tot really like delete and retyping word in computer ar ? ) and dun want to pay me anything.

so, i had stoped totally his job, and to fellow designer. PLEASE COLLECT DEPOSIT BEFORE U START WORKING!