I imagine this will be given high priority so expect an update very soon. Maybe better to wait unless you need one of the fixes.
Thank you Fungus.
The firmware has been rolled back to 1.02.00.02 in
www.rigolna.com.
I have also seen/heard people pointing out that web-control is intermittently sluggish with the new firmware, a pity given how responsive it is with 1.02.
It seems you now have a good willing contact in Rigol support. Maybe, in case they don't follow threads like this one, you can suggest they do some more regression testing comparing with 1.02 side-by-side, before they re-release 1.03. They could also take a look at the FFT issues. (It would be nice if they could relay a list of known issues they are working on for future releases.)
Thanks again.