I solved it by manually downloading and installing the VirtualBox Extension Pack version 7.2.2. Apparently the automatic update didn't update the extension pack, and there was a conflict with the older Extension Pack that I had previously installed.
Get straight to the heart of the HD action with the BDP-S1700 Blu-ray™ player, with super quick start.
Watch the latest Blu-ray Disc movies in Full High-Definition quality, for depth and image clarity far exceeding that of DVD. The BDP-S1700U also upscales your standard definition DVDs to near HD resolution, so you can enjoy astonishing details for all of your favorite movies.
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Sony BDP-S1700U Region Free Blu-ray player delivers Full HD playback and global disc support. Order now at 220 Electronics for smooth multi-region use.
Enjoy your worldwide Blu-ray discs and DVDs with the Sony BDP-S1700E Multi-Region/Multisystem Blu-ray Disc Player. This player will read region A, B, and C Blu-ray discs and region 0-6 DVDs. It supports Full HD 1080p Blu-ray disc playback through the HDMI output.
This Sony Streaming Blu-ray Disc Player - BDP-S1700 allows you to instantly stream your favorite television shows, music, movies, and more. Now you can enjoy your favorite movies on Blu-ray in full HD, or play your favorite DVDs in near-HD quality.
We've tested and reviewed products since 1936. Read CR's review of the Sony BDP-S1700 blu-ray player to find out if it's worth it.