Paste does not work if the selection contains one of the new button icons. Pico-8 0.1.8, Mac OS X 10.11.6.

Repro:
1) In the code editor, enter some text that includes one of the button icons, e.g. shift-x.
2) Select the text.
3) Press command-c (or presumably the copy key combo on another platform) to copy.
4) Move the cursor elsewhere.
5) Press command-x (paste key combo) to paste.

Expected: The copied region is inserted at the paste location.
Actual: Nothing happens.

Try again with a region that does not contain a button icon char and it works (regular copy/paste behavior).

Haha I noticed this too actually. No button glyphs for me until it gets fixed :(