[PROBLEM] Video Overscan Settings Lost

[StartledCat]

Ok, Here goes:
1. Revert SD back to XBian_2015.04.04_rpi2
2. Install required add-ons and update film/tv library
3. Backup SD card using Win32DiskManager (only way to backup that works!)
4. Re-install updates one-by-one:

a. Install next upgrade/update
b. Reboot & Test
c. Backup SD card using Win32DiskManager
d. Repeat

5. Got down to the last one xbian-package-cec…will do this one later today

6. Finally bit the bullet and installed the cec update...fearing the worst, but it went in ok and has not lost the video settings.

Recap - all updates at once (originally in date order) caused loss of calibration.
Selected order of upgrades (not quite random - lib updates first then packages, then xbmc last) - no problem...

...so not solved as such, but seems to be stable :-)