Hi @grazvydas,
Thank for posting in the community!
Sorry to hear that trouble is happening. At this time I suspect there might be something related to graphics with Fusion. As the quick test, can you please turn on (enable) the Limit effect to optimize performance in the Graphics Diagnostic window - see the below image, and see if this makes differences?
** Please make sure that the graphics driver is up-to-date in the system.

If this does not make any differences, could you perform a clean-uninstall using the automatic cleaner tool if you had not tried this? This link details how to do an automatic clean-uninstall. Then download a fresh installer by selecting Download Free Trial on this web page.
If the issue still persists and you have the Error Report window in this web page, can you share some description about the issue (what operation you did last) and send it to us? It would be helpful to investigate this.
Also, I imagine this happened with each design file - if it happened with a particular design, can you please share a public link to the design and post it in this thread?
Hopefully this helps.
If you have any questions, please let me know and I'm happy to help!
Thanks.