Can't step through assembly file in editor window

Hi all,

I have some troubles for debugging with my µvision since I cannot step into assembly files (in a project mixing C/ASM).
Currently, in order to step in my assembly code, i have to set the focus on the disassembly window and step looking at the byte code with the lack of my comments in the src file. Besides, i have no assembly labels, only the corresponding addresses.

I tried to restore the default GUI, but it hasn't solve the problem. I've checked the "Output" tab, and the "debug information" case is marked.

I have both µvision 4 and 5, and the problem only occurs with µvision 5. Is it some kind of new feature in the case of the evaluation version?

Thank you