Preloader testing isnt working anymore

hi,

i want to test my preloader using the “simulate download” function in the preview window. This used to work and i nicely saw the loadbar filling up until it reached 100%. Now it jumps immediately to the main scene. Must be something in the settings cause i just dosnloaded the original script i used for it and also there i cant see the loading process. download settings are 14.4k, filesize is 80k. What could cause this?

thanks!