If this doesn’t help, could you please give us more details to specify the problem:
1. Exact browser version.
2. Exact RadEditor version.
3. Steps to reproduce the problem.
4. End result.
5. Describe what is wrong with the result.
Also, did you try using the RadEditor Flash manager? It inserts flash files in the editor's content area and uploads new flash files, which will be available for inserting.
the Telerik team