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Due to new shortcut functions, if you upgraded from 11.0 to 11.5 some of your keyboard shortcuts may have been disassigned.

By default, you should have the following key bindings :
- Del --> TVPaint Animation: Delete Selection (Fill gap from right)
- Ctrl X --> TVPaint Animation: Cut Selection (Fill gap from right)
- Ctrl V --> TVPaint Animation: Paste

Just for the info

Note about the deletion modes:
- fill gap from left|right --> moves the instances from the left|right in the layer to replace the instances you removed
- keep empty --> erase the content of the instances, do not move
- stay put --> truncate the layer if you remove the instances at the beginning or at the very end, otherwise similar as keep empty