I spotted a bug with the insert image with thumbnail function.
When you add a thumbnail image this allows you to click on it in the published blog, which opens a popup window with the image. Nice! That works great.
However, subsequent normal pics (i.e. not a thumbnail) allow you to click on them also and the same popup opens for the thumbnail that appears earlier in the page.
If you add another image with thumbnail, in the published blog this and subsequent normal images open the same popup.
See the demo here:
Its the same for all templates.