What issues?
There are many...

Actually I will present just some things you could do, when you think that robotlegs is causing the errors and headaches you're getting for several hours...
Even though your robotlegs classes look fine, the context looks fine, everything is as it should be, you get compiler or run-time errors, or even no errors, but nothing happens, right?

Maybe it’s the Flash Builder, not the robotlegs-framework that messed up your project!

Things to consider:

1) Before opening a project (for example a robotlegs demo written by someone) that contains
a) bin-debug (folder)
b) .settings (folder)
c) .actionScriptProperties (file)
d) .flexProperties (file)
e) .project (file)
you should delete those files and folders from your project

2) Check if there is a libs folder in this project on your hard-disk and whether it contains the libraries you need (for example robotlegs-framework-v1.4.0.swc)
If not, create the folder libs and add the swc file

3) Create the project - usual steps:
a) Project Location: Choose a name and location for your project.
b) Configure Server Settings
c) Build Paths: Set the build paths for the new Flex Project or ActionScript project.
Normally FlashBuilder finds the libs folder and you don’t need to do anything if you are creating a FLEX Project
Strangely enough that’s not the case for an ActionScript Project. Even if the folder exists on you hard-disk and it contains the library you need, Flash Builder expects you to add it manually!!!
Click finish

4) Even if you added your libs folder make it a habit:
Check if the libraries you need are in your Build Path: Project->Properties->Build Path->Library Path->libs
If not, then add them:
Project->Properties->Build Path->Library Path->Add SWC Folder
Browse to the location of your libs folder in your project and select it

5) Check if the libraries you need are listed in the FlashBuilder Package Explorer in the Referenced Libraries
(NB: the “Referenced Libraries” appears only if the libs folder isn’t empty)

6) Make it a habit:
Use the feature: Project->Clean
Clean is refreshing/re-writting the bin-debug and the project settings, that somehow contain mixed values, old and new, which confuses the poor FlashBuilder

7) FlashBuilder Package Explorer right click on the project -> Refresh

8) What to do when something goes really wrong with a project’s settings in FB is:
a) right click on the project in the Package Explorer, choose Delete
b) radiobutton: DO NOT DELETE CONTENTS !!
c) go to the folder of the project on your hard-disk
d) delete :bin-debug, .settings, .actionScriptProperties, .flexProperties, .project
e) and eventually the libs content
f) don’t delete src !!
g) go back to FB, create a new Flex/Actioncript Project with the same name and location as the deleted one, following the steps described above
The structure of your project will be intact, you’ll just have new settings.

I wrote this down pretty fast, so if it’s too confusing, I’ll review and rephrase and /or complete it, when I’ll get more time :)
Ondina