Two things to try: Are you able to drag and drop a clip from File Explorer into the library? That may be the simplest work-around, especially if you've already tried uninstalling/reinstalling PhD8.
Also when you hover your mouse over the Import tab, does a blue highlight appear?
There does seem to be a delay on my system with PhD10, and it often takes 2-3 seconds for the selection menu to appear, but I'm running Insider build 18252, which is beyond the Oct 2018 release. I don't have PhD8, but PhD7 operates normally, with no delay.
This message was edited 1 time. Last update was at Oct 15. 2018 19:51
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