Standalone plugin does not receive audio input on some Windows 10 x64 systems

Windows
1

There’s a user of my Win 10 x64 standalone app (standard wrapper for “Audio Plug-In” template project) whose report boils down to the following.

  1. He selects some audio input device in the Options panel. In that panel is a small VU which responds to audio input as expected.

  2. In processBlock I iterate through all the samples in the input buffer (only for channels up to getTotalNumInputChannels, which is 2 in this case) and all samples are 0.0f.

The same binary runs fine on many other users’ systems.