Soloing zones in the Program Tree

Hello,

soloing zones in HALion 5.0.2 doesn’t seem to work for me. When I create three or more (synth) zones and solo one of them in the Program Tree, then only one of the other zones (usually the first one) becomes muted while the other zones continue to play, although their mute icons get orange as expected.

Has anybody run against this problem?

Miloslav