I’ve been trying to fix a drawing problem of my plugin in Sibelius on Mac for a while so I decided to start from scratch.
I turned the JuceDemoPlugin into an instrument and loaded it in Sibelius 6.1.0 and I have the same behaviour
The first display of the JuceDemoPlugin is correct (see attachment)
When I hide it and show it again, the window is blank (see attachment). Actually, the content of the plugin appears very briefly and then is erased. In this example I could also resize the juce plugin window that exceeds the Sibelius plugin container window.
Sometimes the plugin window is displayed when not asked for (see attachment).
I can also have the juce plugin window after hiding the Sibelius application.
It looks as though the Sibelius plugin container window and Juce window where not connected together but I don’t know how to fix it.
I use the 28/02/11 tip.