I’ve got more reports about this, so I’m looking into this.
But I think that @jussi_laako remark about the supported version(s) is important.
Could it be that this explains your issue?
After downgrading Ropieee to a version that includes NAA 5.1.5 HQPlayer 4 started working again.
So I should be ok, as long as I stick to the current Ropieee and don’t make the mistake of upgrading it again.
For my understanding: is there a reason why you wouldn’t upgrade your HQPlayer?
As I’m still satisfied with the soundquality of HQP4 I cannot justify the extra € for upgrading to HQP5 yet.