Stuck in Transform Tool
This has happened twice on Surface Pro 4. Transform tool is activated normally, but transform panel doesn't show up. Selected object can still be transformed by the nods/handles, but can't confirm the transformation with enter key nor cancel by escape key. There's no way to get out of it, not even alt-F4. The only way is to use "end task" from Windows Task Manager;which lose any progress made from the last save.
Hardware:
Windows 10 Pro Hexcore workstation 24GB + Cintiq 22HD, Windows 10 Surface Pro 4 i5