Ok thanks Toady - test.gpxeditor.co.uk hasn't got that bug, but (I think) it has still got the 'antiforgery token could not be decrypted' one, although I often don't get that so you could try test, you might be lucky and not get it either, i think it may be browser dependent.
If you get the antiforgery token one on test as well I'd be keen to hear about it but otherwise I should be able to fix the empty gpx element problem tonight as I can reproduce that.
Will get more stable as it gets more mature, thanks to your letting me know of this stuff. Especially since the work going into the actual mapping functionality is now all bug fixes and not new features, all the new features now for the foreseeable are all going to be along the lines of a route database and a 'my rides' section.
cheers