I know this is a fairly old post, but I just had the same problem. I fixed it by, instead of using the "link to anchor" option, putting "page.htm#anchor" in the standard "link to web or email address" line (obviously "page" is not the name of the page, and "anchor" is not the name of the anchor). This stopped the problem immediately. It disables some transitional "animated" aspects of it, but I think Xara's attempt to animate the jump to the anchor was the problem.