I've done very little testing on MAC, but I've added an extra option you could try.
In a file called "EndevoUML.ini" (I've forgotten to change that name :-), that is located in:
<Documents>\LabVIEW Data\Open_GDS
Or if you're not using OpenGDS, it will be called Endevo_ or Symbio_
The last item in this XML-file, you find a "No" value, change it to Yes.
Some features will be disabled, but it might help the stability.
Let me know if it did anything.
<Array>
<Name>Params</Name>
<Dimsize>1</Dimsize>
<Cluster>
<Name>Param</Name>
<NumElts>2</NumElts>
<String>
<Name>Name</Name>
<Val>I have problem with UML stability on my computer</Val>
</String>
<String>
<Name>Value</Name>
<Val>No</Val>
</String>
</Cluster>
</Array>
</Cluster>
