:| yep, that is a bug the problem is this line: this.container.appendChild( this.canvas ); <blockquote style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;" class="gmail_quote"> from what I understand this if block is supposed to get you the context of canvas that is already in the DOM. The this.container.appendChild(..) adds a new canvas element w/ the same ID. Is this what you intend? </blockquote> no!, my intention was to add the previously created canvas element as a child of the specified container, this is useful if are not using inline canvas declaration... this line must me inside the "if block" around line 627 thanks for reporting the bug. btw. should we use <a href="http://launchpad.net">launchpad.net</a> fro reporting bugs? <div class="gmail_quote">2009/9/4 Bryan Berry <<a href="mailto:bryan@olenepal.org">bryan@olenepal.org</a>> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Felipe, on line 636 of jquery.karma.js <a href="http://git.sugarlabs.org/projects/karma/repos/mainline/blobs/master/js/jquery.karma.js#line636" target="_blank">http://git.sugarlabs.org/projects/karma/repos/mainline/blobs/master/js/jquery.karma.js#line636</a> if ( this.canvas.getContext ) { this.ctx = this.canvas.getContext("2d"); this.container.appendChild( this.canvas ); } from what I understand this if block is supposed to get you the context of canvas that is already in the DOM. The this.container.appendChild(..) adds a new canvas element w/ the same ID. Is this what you intend? It produces a result that is not why expected. My drawing operations happen in an area completely unrelated to my actual canvas. -- Bryan W. Berry Technology Director OLE Nepal, <a href="http://www.olenepal.org" target="_blank">http://www.olenepal.org</a> </blockquote></div> -- Felipe López Toledo