What is your Shotcut version (see Help > About Shotcut)? Is it 32-bit?
Can you repeat the problem? If so, what are the steps?
I have reproduced this problem in a simple video.
Use ‘open other’ to create a colour entry on the timeline
Add the text: simple filter with no changes. This works okay.
Use the keyframes to alter the start and end point of the text: simple filter. This works okay.
Use the keyframes to add a fade into the text. This crashes Shotcut with no error message.
Re-starting Shotcut and running the video again will cause it to crash every time.
I can’t use text: rich as I want an outline on the text.
Thank you for your assistance.
I have a similar problem using OS 10.12.6:
Shotcut 21.03.21 crashes when I rearrange views of separated timeline and keyframe when player/filter view after setting properties of text (rich text since I am using the scroll animation available, ie., scroll from bottom. This happens every time I reload the saved project and rearrange separated views.