Thanks, Daniel, for the suggestion. However, this is not the problem. I get no window at all, neither a builder, nor a coder window (actually, I use Coder, rather than Builder, and I know how to switch between them). In some sense, it probably is a Windows problem, but even though I am a Windows user for a very long time, I have no idea how to tackle this. Normally, very hard problems in Windows are finally resolved by deinstalling and reinstalling. As said, I tried this, but it did not help. Until a couple of days ago, I had a working install of PsychoPy. I updated to the very recent version, which, however, had some problems. I then decided to go back to the previous version. Not a big deal, normally. But with the reinstall of the older version, a completely new behavior emerged. Selecting PsychoPy from the start menu obviously starts the program: The logo appears, and some status messages are displayed. But instead of giving me a Coder (or maybe a Builder) view, nothing happens. PsychoPy appears in the task bar, indicating that the program is started, but there is no window, nor an obvious way select one. I might say that this is not the most daunting problem for me as I heavily use the anaconda install and code with Spyder. But the PsychoPy standalone is helpful sometimes I would appreciate having it. Any further ideas?