Hi Peter,
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You might be better off using the “output” view for a more explicit view of what fixture is doing what.
Having said this, we have made some improvement’s in this area in R4. I would expect it to work as you expect when selecting a single fixture. Feel free to check out the beta for yourself, its posted in this post
Vista 3 R4.0 Public BETA #1 - Now available! -
We use the “global” event value for what we display in the presets. Update them with a new global value and they should again work as you expect.