More data on Win 10 debugger lockups.
Recently got a new machine with Win 10 Enterprise v1909, build 18363.535.
I previously had no debugger lockup problems (excepting self created) using Win 8.1.
The problem now, best that I can currently determine, is in debugging local procedures.
If I put a breakpoint within a local procedure and then try to step execution to procedures/functions called from that local procedure, the debugger will lock without any error notice. The problem has been consistant for me but can be avoided with better planning in setting breakpoints.