<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">18. 4. 2020 v 22:25, Bruce Mutton <<a href="mailto:bruce@tomo.co.nz" class="">bruce@tomo.co.nz</a>>:</div><br class="Apple-interchange-newline"><div class=""><span style="font-family: Calibri, sans-serif; font-size: 15px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">I think it is a bug. If the user hides all of the centreline objects, and also hides all scrap objects (or something like that), then Therion should trap the error and exit in a controlled manner, rather than letting metapost get in a tangle and produce a mess of messages until it finally crashes.</span></div></blockquote></div><br class=""><div class="">Yes, it looks as it is bug. Because there are objects in that scrap - three stations from which Therion may „georeference“ sketch which is a part of the scrap too. Hide representation of objects means only to not include them in the final drawing. </div><div class=""><br class=""></div><div class="">Martin</div><div class=""><br class=""></div><div class=""><br class=""></div></body></html>