Just to be different, i have a problem.
It "hangs" after "Preparing files, wait a moment"... 9 hours and it didnt end preparing.. its not normal... the problem here is that you delete the ispconfig working folder so, the httpd cronlog job fails and tear down the "·$)"($)·" apache
I had to comment it to make it work and im trying to reinstal ispconfig now... but it dont work