The a href tag causes problems together with image tags.

scenario 1:

insert image

select image by clicking once on the image (resize squares appears)

Insert link by clicking on the Insert Link button.

Result: a href tag appear before img tag: <a href=url></a><img src=image>

scenario2:

insert image

select image by placing the cursor before the picture and pressing Shift+ArrowRight.

Insert link by clicking on the Insert Link button.

Result: a href tag is inserted correctly: <a href=url><img src=image></a>

scenario3:

Complete scenario2

Select the image and click on the Insert Image button (or simply double-click on the image)

Change border size and click insert.

Result: img tag is replaced, and inserted before the a href tag: img src=image><a href=url><</a>

As you can see, there are several pitfalls for the average user...

Regards, Thomas