<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><blockquote type="cite"><div><br>It's hung on the filling of ghost zones. I introduced a bug a while<br>back that I then backed out sometime in June; could you make sure you<br>are on a recent revision (you have to also make sure it is rebuilt,<br>since the bug was in C code) and then try again?<br></div></blockquote><div><br></div><div>I'm running a fresh version of yt that I installed via the install script just this month. That should have been ok? I can do a fresh install though and check. </div><div><br></div><blockquote type="cite"><div><font class="Apple-style-span" color="#006312"><br></font>Looks like you are in IPython. sqrt is not in any name space, but<br>sometimes IPython can import it, for instance in pylab-mode. Just use<br>na.sqrt to make sure.<br></div></blockquote><div><br></div><div>Got it -- thanks.</div><br></div><div>Elizabeth</div><br></body></html>