Hi Staffan, I looked over our previous conversation and did some more research. This appears to be a problem with Qt on ARM Macs in general.
I thought I saw mention somewhere of the problem happening specifically with the prepackaged builds of Qt, so I built a newer version of Qt (6.9.3) locally on my laptop and built a version of SoulseekQt against that. That's all I can think of trying right now, but let me know how it works for you:
Thanks, Nir