in IE, when using keyboard in Drop down menus (for example, adding a resource or activity, or selecting a language in the user profile, or using the drop down menu on top left of each resource/activity page), it is necessary to be extremely fast to select an option.
If you are not very very fast, the first option is always selected by default. The problem does not appears using FireFox.

Possible solution: add a flag in the user profile allowing people to show the menu buttons (currently available in the code, but enclosed in the NOSCRIPT tag). This way people using either keyboard or mouse will be able to use the drop down menus.