I found a little bug in the version I just released (v0.1.5).
The bug prevents the program from pasting text at the very top position, and also copying or pasting while moving the cursor outside of the window fast sometimes caused crashes...
So I patched this error and uploaded the new beepcomp.exe file you can overwrite the exiting one with.
You can download it here:
https://sourceforge.net/projects/beepcomp/files/patches/windows/v0.1.5/
I apologize for the inconvenience that this may have caused you.
(but hopefully the error did not affect too many people :))
Sincerely,
Hiro