Infopath debug

Hi, sometimes I am able to debug an infopath FormCode.cs but sometimes don't... why???

Those are the steps that I follow after the form is published:

#Disable feature on site collection level
Disable-SPInfoPathFormTemplate -Identity "Formulaire VCF - Audit.xsn" -Site "http://...:86/sites/blabla/"

#To Uninstall the existing xsn Form Template
Uninstall-SPInfoPathFormTemplate -Identity "Formulaire VCF - Audit.xsn"
stsadm -o execadmsvcjobs

#Install the new solution based on the .xsn file path
Install-SPInfoPathFormTemplate -Path "C:\Users\ext.renato.iskandria\Documents\Formulaire VCF - Audit.xsn"
stsadm -o execadmsvcjobs

#Enable feature on site collection level
Enable-SPInfoPathFormTemplate -Identity "Formulaire VCF - Audit.xsn" -Site "http://...:86/sites/blabla/"