Aseprite 1.2-beta10.1macOS Sierra 10.12.5
While Pencil tool is selected, if I hold cmd key to move layer and then I push shift to move it straight an error pops out saying, that I cannon modify the sprite and it is used by another command.
Hi @chuckchee, you're right, I was able to reproduce this, I would consider this as high priority, so a fix will be released soon. Thanks for the bug report!
This bug is fixed on Aseprite v1.2-beta11, I'll close this topic (please create a new topic in case that the bug is still present or reappears).