They are aware of this issue and are working on it, as I also had the same issue.
For a temp fix make sure roon window on the core machin is left open, worked that way for me.
Exception Message: get_spec_aspect requires a non-zero width and height
at ..\ui\queue.broo:4132 [ae96b1:005b] equation
at ..\ui\queue.broo:4148 [ae89e4:0007] equation
–[ Inner Stack Trace ]------------
Sooloos.Client.Models.brooexposure_BROKERImage.method_get_spec_aspect(Image o, String aspect, Single width, Single height, Single scaleFactor)
Roon.Client.BrooModels.DLL, IL 26, N 257