720p over HDMI - black bar issues

Hi all.
I've got a 1st gen V-box, which worked great until about 9 months ago.  I had been happily using 720p over HDMI for about a year.  However, I suspect a software "update" around this time caused problems, as the 720p and 1080i settings are now incredibly unreliable.
Specifically, when I set the box to show HD resolutions, there are usually black bars down the left and right of the screen, cutting off those sides of the picture.  Sometimes the picture displays properly, but this is usually only temporary - after a day or two of thinking everything's sorted, the dreaded black bars reappear when starting the box up for the first time that day.  Rebooting doesn't seem to help.  The bars even overlay the menus, so it seems to be affecting everything not just live tv.  The full picture is shown when I use standard def over HDMI however.
Has anyone else experienced this and if so any ideas how to fix? 

Hello
On most platforms, I've experienced black bars at the sides, noteably lower bandwidth channels such as kids or shopping often display what you describe when using any HDMI setting in my experience.
Thre is the ability to hit the shortcuts button on the bottom right of the remote which allows you to scroll through to then stretch the image if you wish- but It doesn't always work, I'll stress again this also happens on my FREESAT box, so I don't think it's an issue generic to Vision.
Couple of questions though,
1: Is it a Toshiba tv? (some firmware upgrades to these sets have caused numerous issues and lip synching problems.
2: have you tried a different HDMI cable? (apologies if that's blatantly obvious!)
I've not tested V.1.5 black box yet to see how this issue is there (note I don't call it a V2 box- as it's **bleep**).
Hopefully, if the rumours are true the development team will scrutinise the forums, realise these issues do indeed exist and can work towards a solution in the Freeview HD offering of whatever comes out next:
My moneys on V1.75 in neon pink with no scart (I know...I'm evil)..

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