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It was not, i set it on,

No, I was confirming that you had it 'OFF', I thought that 'on' could be a cause of the problem.

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besides pressing generate causes the plugin to disappear

You can click anywhere on screen to bring it back. Cubase really likes to be in front, and that happens in our testing as well, and we are working on that. This is unrelated to the main problem you are having.

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loading a full blown complex MGU in 1.9.19 still takes forever,

We need to simplify this problem:

1. Load the standalone version.
2. Select any RealStyle (Select button to open StylePicker, click on a style and press OK).
3. Press Generate. Does this work for you?

Andrew
PG Music Inc.