There is a short coming of the text editor we are using. It only show anchor links that are in the same block of text. If you want to link to an anchor in another text block you will need to enter it manually.
While in the text editor’s Link dialog box, rather than clicking on the tab labelled “Anchor” just leave it on the tab labelled “Link Info”. Choose “” from the Protocol drop down menu then enter the name of your anchor prepended with a hash symbol (#). So if your anchor is called “down_here” then you would enter “#down_here” in the URL text field. (without the quotes)
Hope this helps.
If you continue to have a problem please send a request to firstname.lastname@example.org with a link to your page so we can have a look.