Blocks Workspace is Empty

Always, when I try to load my project, I get the message "BLOCKS WORKSPACE IS EMPTY". and tell me that screen blocks for the screen_x (Tela_01 for example) are empty. If my response is "NO, DON'TSAVE", the system try to load the project again and send me the same message but with another screen empty (Tela_02 for example). And try and try again, every with different screens. Some times, rarely, the project loads fine, but some pictures for the screen (button, image, etc)  are disapeared. Please, what's happen ? My  project is to big? Is a problem with my browser (Firefox and Chrome) ? Thanks in advanced.