Editing existing events causes html code to be displayed in descriptions. After looking on the user forum, this is a known bug. The suggestion was to delete the event and recreate it. I tried this and just got a database error everytime.
Also, having to add events from the front end, with no back end facility, is a bit of a pain.
I will probably use this component on my sites when it is sorted as it's just soooo pretty, but for now I just can't trust it.
All these issues have been addressed in the 1.5.x series.