HQPlayer 'Library' Scan

Has anyone tried to scan the music library from the HQP Configuration screen (Library tab)?

I get an exception showing in the HQP Log:

no issue here, whats the device, what AMS software?

CX, 5.0.0 … get the same result, without any delay, whether Backend set to to ALSA or Network. HQPe is not licensed but would not expect that to cause a problem. Everything else in log looks OK:

Rebooted CX … now scan is working!?
Thanks for quick response anyway.