<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi Yuhong,<div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>That is a weird problem, particularly that it happens on only one of two macs you have. It certainly doesn’t happen for me. If I open Chimera’s IDLE shell and type in similar commands to yours, they work fine. If I run the commands from a file (attached), they also work fine. So you should probably look at the saveSession() routine in SimpleSession/save.py and (on the problematic mac) make the same calls as it does and see what they return, namely:</div><div class=""><br class=""></div><div class="">what does os.path.dirname(“current_session.py”) return?</div><div class="">after your os.chdir(path), what does os.getcwd() return?</div><div class="">what does os.path.exists(path) return?</div><div class=""><br class=""></div><div class="">If those look okay, you probably should insert print statements in the saveSession() routine to get some kind of idea about what’s happening.</div><div class=""><br class=""></div><div class="">—Eric</div><div class=""><br class=""></div><div class=""><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Eric Pettersen</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>UCSF Computer Graphics Lab</div><div class=""><br class=""></div></div><div class=""><br class=""></div><div class=""></div></body></html>