Cannot debug startUp methods

Hi,

In the latest version of Pharo (Build 439 – sha 4810710), I would like to debug a startup script, but when I set up an halt in the method, the image is not able to start anymore…

For example, when putting an halt in

LanguageEnvironment class>>startUp

                self halt.

                self clearDefault.

And restarting the image, I got this trace:

[0mLanguageEnvironment class>>startUp

LanguageEnvironment class(Behavior)>>startUp:

ClassSessionHandler>>startup:

[ :arg2 | arg2 startup: arg1 ] in WorkingSession>>runStartup: in Block: [ :arg2 | arg2 startup: arg1 ]

[ arg2 value: arg3 ] in [ :arg3 |

[ arg2 value: arg3 ]

     on: Exception

     do: [ :arg4 | self errorHandler handleError: arg4 ] ] in WorkingSession>>runList:do: in Block: [ arg2 value: arg3 ]

BlockClosure>>on:do:

[ :arg3 |

[ arg2 value: arg3 ]

     on: Exception

     do: [ :arg4 | self errorHandler handleError: arg4 ] ] in WorkingSession>>runList:do: in Block: [ :arg3 | ...

Array(SequenceableCollection)>>do:

WorkingSession>>runList:do:

WorkingSession>>runStartup:

WorkingSession>>start:

SessionManager>>launchSnapshot:andQuit:

[ tmp3 := self launchSnapshot: arg1 andQuit: arg2.

tmp1 signal ] in SessionManager>>snapshot:andQuit: in Block: [ tmp3 := self launchSnapshot: arg1 andQuit: arg2....etc...

[ self value.

Processor terminateActive ] in BlockClosure>>newProcess in Block: [ self value....

WorkingSession>> runList:do: should have catched the exception and opened the image, but I do not seems too….

What can I do to resolve this issue?

I forgot to say that I am under Windows 10 ;)

Thanks in advance for your help,

Cheers,

Vincent