[popcornmix]

Anyone else suffering with hdmi flickering when idle using the latest build?

I've not heard anyone else mention this.
Try a different hdmi lead (or different hdmi socket on tv).

Try the boost option:
http://elinux.org/R-Pi_Troubleshooting#I...VI_monitor

Measure voltage:
http://elinux.org/R-Pi_Troubleshooting#T...r_problems

Try disabling any overclock.
Try changing the hdmi mode to a lower resolution or refresh rate (in system/settings/video).

If Frodo doesn't have this issue, it doesn't mean the power supply is definitely good.
The optimisations made in Gotham does mean more work gets done in the same time which can increase the power requirement,
which can show up if the power supply was borderline to begin with.