What is your operating system?
What is your Shotcut version (see Help > About Shotcut)? Is it 32-bit?
Can you repeat the problem? If so, what are the steps?
My Shotcut was working just fine as I’m an AMV creator on youtube, but for some reason after my last few projects it’s suddenly buffering like crazy, freezing for like 10 minutes just from adding clips to the timeline until it gets so stuck I have to forcibly close it as it won’t respond. I’ve tried uninstalling and reinstalling the software to no success, neither did clearing up space on my computer in case that was the issue. I honestly don’t know what is going on.