SUMMARY two bugs happening. three, actually, as a noticed just now. 1 - whenever I am already editing for too long, razor Tool starts to behave weirdly. I click razor on a video block and instead of splitting it, the right block of the video jumps to the very start of the track. 2- I then try to ctrl-z it and the message "ambiguous shortcut" appears, stopping me from undo it via ctrlz keyboard shortcut. I then get tired of trying to work on this particular video block, try to delete the whole block of video hitting "del" button, and guess what? same message: ambiguous shortcut. close application, start it again and keyboard shortcuts comes back to normal... 3 - ...except now, when I click "del" to delete a whole video block, said video block gets deleted. shortcut working. but then I click "ctrl-z" to undo the deleting, the video block does not comes back to its original position. it shows up at the start of the video track. worth notice that, hitting play, the video block image is displayed as if the block were at its original position. like a ghost video block or something. *** *** STEPS TO REPRODUCE 1. 2. 3. OBSERVED RESULT EXPECTED RESULT SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: (available in About System) KDE Plasma Version: KDE Frameworks Version: Qt Version: ADDITIONAL INFORMATION