Known Issues

Folder/Table
The table view of folder elements starts with number 0 instead of number 1.
The selector doesn't correspond to the tabs of elements, and some parts do not get displayed (properly).

Reporting
Including diagrams in a report will demand to press "Cancel" once for each (!) included diagram.
Specification Elements
Cascade Delete does not cascade to diagram elements.
RED on other platforms
Using RED on Macs, opening diagrams sometimes derails the whole process, sometimes it just consumes disproportionate amounts of ressources, but comes back, or stays responsive.

"Agile" requirements approaches are not covered.
They are, it's just that I refuse to use the newfangled and non-standard names things have been given by agile evangelists to increase sales of their products - I stick with the established name. Usually, it is also the more descriptive one.
But "Agile" requirements management is definitely not covered!
True, and we're working on that. However, this is a course on all of RE, so RE management is just one out of many topics, and "agile" RE management is just one out of many (relevant) ways of doing it. So if you're really into agile processes, you should probably be reading a book/lecture with a much more catchy and entrepreneurial-sounding title.