When:

• debugging a C/C++ program
• using CDB
• with the option "Use Python dumper" enabled
• with the option "Use Debugging Helpers" enabled in the Locals window
• and you try to stop at a function that has an argument of type char** or char*[]

The debugger freezes trying to populate the Locals window, possibly because the python helper doesn't understand variables of type char** or char*[]

WORKAROUND:

Disable "Use Python dumper" or "Use Debugging Helpers".