I have the same problem
My phpdesktop app stopped working probably after updating chrome on that PC on 2nd November. Before, it was running fine for a months with no change.
It is same on Windows 7 and 10.
I figured that html files are processed correctly.
Seeing this in log, but I am not sure whether it is connected with this problem
[1105/105221.951:ERROR:child_thread_impl.cc(762)] Request for unknown Channel-associated interface: ui::mojom::GpuMain
Tried to run with --disable-gpu, but no effect
as suggested in similiar issues (not related to phpdesktop) for chrome/chromium