Qtractor on RaySession can't appear GUI

[OKKyu]

Hello, I have a trouble. My Qtractor launch on RaySession, but don't appear GUI.
My Environment is below.
OS: Ubuntu Studio 24.04 LTS
Qtractor version: 1.3.0
Qt version: 6.4.2

3 weeks ago, I try to use Qtractor version 0.9.39 but it is freezing and can't work ( nevertheless it is newest version on Ubuntu Studio 24.04...). then I download qtractor's source from homepage ( https://qtractor.org/#Installation ) and do cmake build. My build was wrong?

[rncbc]

hi, can't tell whether a qtractor thing or raysession's... (I don't have the means to test the later, and sorry to tell, not willing to... my distro doesn't like pip and me neither:))

but it all surely works as intended on non-session-manager and new-session-manager--just tested on both accounts--and so, it seems, maybe a raysession issue to begin with...

byee