I'm pretty sure it's still subscribed - the Unsubscribe method is not being called before I call Update.

Also, from the .Net side I see the following in the log. I don't know if it helps.

33775 [1496] DEBUG Lightstreamer.DotNet.Server.RequestReply.NotifySen der (null) - Notify line: 1248872819081|UD3|S|188|S
|100000122c6d583bd|B|0|S|value1|S|1|S|value2|S|cra ig