I am really trying to get my head around Cloud Deployment and Programming cloud, and the more I use it, the more I think it is a fantastic product. At least in principle. I successfully deployed a range of Manipulate 'applications' to the cloud and they work neatly. Now I wanted to do something more challenging and produces a little larger code (40 kb Mathematica nb). I tested the principle elements in a cloud deploy and it works. However, the more complex program doesn't work. I tried a tedious amount of possibilities – it doesn't work. This is especially frustrating, as there is no feedback at all what the problem is. I just get a white webpage with nothing on it. I can get it to work when compacting the program, but obviously that doesn't help in the long run. It's not a complicated program and on Mathematica it works without any delays. I've no idea why it won't deploy to cloud, i.e. it seems to deploy, but the webpage remains blank, no matter how long I wait. Any help much appreciated!