Dear Sir/Madam, I am trying to debug one of the existing plugins to help my understanding of how to write my extension. Usually, I would place "import pdb; pdb.set_trace()" in some lines of the program where I am interested and run it. And when the program encounters this line, it will stop, so I can go through line by line to follow the logic of this python program, which is really helpful. However, when I did this to one plugin of chimera, the plugin and chimera seems frozen, I mean, both didn't respond and there is no "(Pdb)" prompt in opening shell as normally did. I tried this in different places in different scripts, none worked. So I would like to ask how to enable this feature in Chimera or are there some other ways for debugging in Chimera? Sincerely, Shuangbo