generative modeling for Rhino
I have seen this a number of times with all kinds of applications on different versions of Windows. Usually if I wait for a bit the message goes away, but sometimes I have to kill the application via the Task Manager.
I don't know what causes it and I certainly don't have a solution. If there's some steps that allow me to repeat this on Grasshopper then I can try and look into it deeper, but in my experience this Server Busy crap is quite unrepeatable.
I can't really help with making the process faster or with patience to wait, but you can at least suppress some of these warning messages using this rhino common method:
this did help me when using VB.net code to communicate with Excel and others.
Just add this line into your code and you should be fine.