[Pharo-project] Debugger code edits lost?

Please do not ask me how to reproduce this... :) Actually, I *think* it might be triggered by certain types of syntax errors. Bottom line is that the sometime I do a fair bit of coding in the debugger, only to find that the fruits of my labor went to oblivion and beyond. Gone - no trace of it. It has happened enough that that I believe there are legs to it. Has anyone else seen it?