I just restored my iPod Touch 4G (8GB) about an hour ago, installed Cydia followed by SBSettings. I enabled the HD theme and reloaded Springboard and it worked, showed the theme.

However, I'm now faced with the same problem I had before I restored.. SBSettings won't change its theme anymore and I don't know why, Google finds nothing.

I change it as I have always done, swipe the status bar, click more, apply the theme, Home button out of SBSettings and let it reload Springboard. (I've also just opened the application itself to change it, nothing)

Note: I installed OpenSSH before trying to change to another theme, but I don't see how that would affect it.