This is the version I am currently using. It seems like the recurring events code has been copied from another calendar because it is having the same exact problems.
I am not able to find a single calendar module that works properly. Every single module has problems with reoccurring events.
I've tried downloading several from the module repository and the website links to check on the developer's sites as well however every module has had the same problem.
How can you change this to Koivi editor or any other editor?
It seems strange that even though these editors are fairly stable, most Xoopers recommend using HTML and now modules use WYSIWYG editors. Why doesn't the System Core follow suit?