OSMC's June update is here with Kodi v18.7 - OSMC

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@LarryBeans

The reason I want to restore the previous version is that after I installed 18.7 today on my Vero, all of my movies stopped playing. When I try to play them, the screen might go on for a few seconds, then it fails and goes back to the main menu. Some change happened that broke my ability to play any movies. Some video content still works, seems like if I were to guess stuff with low bitrate. But my Blu Rays that I have rips of or have made MKVs out of, nope.

Are you using Kodi SMB mounts to access your Movies?
If yes check this thread

SMB connection issue after June update

Now that I can finally respond again, the solution by JimKnopf worked wonderfully. Thanks to everyone who tried to help.

If you are not sure provide log files so that we can check.