Based on my experience with other electronic devices that uses a HDD, when encountered such IO errors, please do a FULL Scandisk on the HDD with sector check & repairs settings enabled.

It will be VERY-VERY lengthy scan but it does worth it.

Already used a HDPro+ for over 2 years and never encountered such error with this unit, but recently a friend's new;y-bought A.C Ryan tends to encounter such error multiple times.

Hi all and bro fylon,
Sorry I'm not an active user, heck.. even my post count got resetted..
I thought was trying to help, as even you asked about the IO Playback error, I'm telling based on my experienced only.
Sorry if anyone offended.

BTW, I used the Dat@ge firmware (HDpro-s_YG_Mar_29-2011) for my HDPro+ and it seems it work out OK, only blackout at the App page.

Personally, I like my current HDPro+ (even though it's already outdated compare to all these new player in the market) it has served me & my family well.

Bro, Youtube not working.
I have no issue with preview mode ON.
Hope that helps :-)