A new bug (DSK-380871) arose in Opera and it's severely affecting modern scroll:
modern scroll disappears as soon as you restart Opera!
I now found the culprit!
There's a newly introduced bug in the "Delete Private Data"-function of clean Opera 12.12 (12.13 fixes this :up:) installations, which wipes out extension data.
To get rid of the bug
- go to Opera → Settings → Delete Private Data…
- uncheck "Delete persistent storage" (if you don't want it to actually delete anything go ahead and uncheck all of them)
- click "Delete" to make it save your choice
- Now you can either open modern scroll's options page and press F5 or uninstall modern scroll, restart Opera and reinstall it to permanently make it work :up:
You can re-enable "Delete persistent storage" now if you want to. The bug should be gone.
Man, that sucked :ko: