In Unicode Dyalog, the Ctrl+X, Ctrl+C, and Ctrl+V keys can be assigned either to clipboard operations or to generating APL characters. If copy and paste are not working, these keys are usually configured for glyph input.
Why This Happens
Unicode Dyalog allows Ctrl+X, Ctrl+C, and Ctrl+V to generate APL symbols. This behaviour is controlled by the Keyboard Shortcuts settings.
How to Restore Standard Copy and Paste
Open Options → Configure → Unicode Input and press the “Configure Layout…” button.
Select “Use Ctrl+X, C, V for clipboard”.
Summary
Copy and paste shortcuts usually fail because the keys are assigned to APL glyph generation rather than clipboard operations.
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