Thanks, finally I figured it out that it because I always use remote desktop to control the pc running HQP, now after edited the group policy there is no issue.
Also want to share with you is I installed virtual CD (deamon tool lite), because I have many single FLAC files with cue, now I can create new "virtual cd" for those CUE files, then play it as CD in HQP, don't need to split FLAC, it shows each track like "real cd", it also works on APE file, don't need to convert it to FLAC.