Faded Labelled box seems to cause a crash on RPi

I have a toolbox application that is crashing on the RISC 5.21 on the Raspberry Pi. By a processes of elimination it appears it is a toolbox labelled box that initially starts up faded that causes the crash. To remove my application from the equation I then tried creating one in ResEd and found that would also crash.
I created a window, added the labelled box went into the edit screen and set the fade check box. With my old Res file I found that editing any field on the window caused a crash. But it only seemed to happen with the faded labelled box there.
I tried the latest RC12 ROM from the Pi downloads page and that also crashed. It didn’t seem to crash on my RPCEmu on Linux running the last released ROM and has been running successfully on RISC OS 4 on RPCEmu on Windows for a long time.
Can anyone give this a try to confirm this is a bug?

Any more info on the crash itself (e.g. the post-mortem)?

I suspect it’s this bug that your seeing. It’s present in RC12, but should be fixed in the latest development ROMs.

I suspect it’s this bug that your seeing. It’s present in RC12, but should be fixed in the latest development ROMs.

Thanks Jeffrey, I’ve downloaded the latest ROM and tried it and can confirm the bug is fixed in it.