Hi Whaat! Finally had the time to test Indigo 2.2.7 with SkIndigo 2.2.3 - don't even know if they're fully compatible.
BTW I find the plugin working just fine, except for a couple of things about the mat editor:
1. I see that the double-click over a SU mat doesn't trigger the popup any more, at least for me. I suggest you re-enable this feature.
2. It is really cool to have the possibility to switch SkIndigo mats with the top drop-down list you added, but it is totally misleading not to have a correspondence between the selected SU mat and the one we selected with the drop down list. Don't know if it is clear: I choose mat1 from the SU panel and I call the SkIndigo mat editor; then I switch (through the editor) to mat2 but in the SU panel mat1 is still selected. I am an experienced SkIndigo user and last night this really puzzled me

.
3. Last thing. The SkIndigo mat panel somehow "remembers" the last mat you edited, so when you recall the mat editor after you closed it, that is the current one. This is misleading too, for someone wants to edit the mat he double-clicked on, and not have to browse in the drop-down list to search for the mat he wants to edit again.
This is basically it Whaat.
OH another thing: don't know if you've read my "turbidity" topic, but either something wrong is happening inside Indigo or you have to adjust the lowest and highest values in the SkIndigo scrollbar. Just to avoid confusions.
BTW this is the scene I've been practicing on with SkIndigo 2.2.3: