This issue is resolved in a newer version of Logger Pro, which is a free update. The updater is a free download from our web site at:
https://www.vernier.com/tech/lpupdates.html

If the “Open with Rosetta” option is checked in Logger Pro 3.5, then videos will play back very poorly, with skipped frames and many black frames. Uncheck the box in the LP Get Info box to run in native Intel mode.

Some users have tried to run LP in PowerPC-based Rosetta mode on their intel-macs in order to user the original Proscope, which only runs under Rosetta. Use a Proscope HR instead.