<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="">Dear GSAS folk<div class=""><br class=""></div><div class="">When I switched to GSAS II from its predecessor, I immediately liked what I found and had a very good experience. I successfully tackled some new data and got my team running it.</div><div class=""><br class=""></div><div class="">But more recently, whether it is connected with an upgrade or not (I now have version 4187), I am finding GSAS to be very flaky, and when I ask my team if they have the same experience they say they do.</div><div class=""><br class=""></div><div class="">For example, sometimes refinements after pressing the Refine command just don’t happen. Nothing happens, or if it does. sometimes nothing changes. There seems no information. The data plots seem to behave chaotically needing a press of the home button to restore order. Sometimes values get reset on reloading. Sometimes I have to switch from analytic to numeric to move forward. Or quit and restart.</div><div class=""><br class=""></div><div class="">I may be doing something wrong of course, but since I have been doing Rietveld refinement for a long time I think I know what I am doing. I was ok with GSAS I, never finding flaky behaviour (but I can’t go back, even I wanted to, since it is no longer working on the latest MacOS). Perhaps it is a Mac-specific problem (I am on the latest MacOS, but my colleague is having similar problems using a Windows tablet computer).</div><div class=""><br class=""></div><div class="">For what it is worth, right now we are refining data from the new Chinese Spallation facility.</div><div class=""><br class=""></div><div class="">I don’t quite know what to ask more specifically but for the moment this is to initiate a discussion perhaps.</div><div class=""><br class=""></div><div class="">Best wishes</div><div class=""><br class=""></div><div class="">Martin Dove</div><br class=""><br class=""><div class="">
<div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Optima; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">–––––––––––––––––––––––––––––––––––––––––––––––––––––––––<br class="">Martin Dove<br class="">School of Physics and Astronomy, and Materials Research Institute<br class="">Queen Mary University of London<br class="">Mile End Road, London E1 4NS<br class="">Tel. 020 7882 3426</div></div>
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