Recently upgraded to Movie Studio 18 while retaining the version 17 for comparison and discovered a problem with the playback.
I'm getting garish bright green flickers on the playback that are not present in the source MP4 when watched and the same effect is rendered to the finished video.
Tested on version 17 and the problem doesn't occur.
Also tested a Sony *.MTS source video in ver 18, and that didn't display the issue.
Worth noting that this is on an AMD R9 270X series hardware with the latest drivers installed so I need to test this against a different system with a newer graphics card to see if it's similarly affected there.
File type is MP4, captured on Snaggit.
Codec: H264 - MPEG-4 AVC (part 10) (avc1)
Windows 10 64 bit machine
Movie Studio version is 18.1.0.24
Any ideas?