Magix Vegas not responding when splitting or deleting video while it plays

I have vegas 18.0 build 527 every time I split while I am playing a video or hit delete while a video is playing vegas would freeze or be not responding.

what worked for me to make this go away was to go in to Options/preferences/file I/O and put a check mark on Enable Legacy AVC decoding. now I can split while playing or hit del without lock up.