HBBTV and BLINDSCAN are working perfectly for me on BH 2.1.0.1 on duo2.. so I would suggest reinstalling them..
I would imagine that you can use a personal configs backup on the latest 2.1.3 ,
The backup ,just like a full backup will be found in the media/hdd folder, irrespective whether you have a hdd installed or not..
best to unplug all usb sticks and HDD just in case the instructions are misinterpreted.
The most recent backup will overwrite the older backups therefore you will only find the most recent..
when restoring a personal backup , you are asked which plugins,settings,configs you want to restore ..
On a side note, after updating a new channel list, the terrestrial.xml was blank,but this was a simple transfer of the file which sorted this out in seconds...
Final note : it´s good to be nervous when going about these things as it keeps your mind sharp !!!!!!
Enjoy it..