Can't debug break inside iup process

[robertlzj]

Can not break inside MainLoop.

iup=require'iuplua'
iup.dialog{
	map_cb=function()
		print'cant break here'
	end
}:show()
print'could break here'
iup:MainLoop()

Tried:

• The code could work (breakpoint anywhere) on another PC .
• I have checked FAQ.
• remove 'user.lua'.
• Pull lastest ZBS version.
• debugger.verbose=true, Debugger Server could work.

Env: Lua 5.3, iup 3.31

There is some symlink among dll files (like from bin/clibs53/iuplua53.dll to bin/iuplua53.dll), I think it is not the cause.