Copy-Paste form external sources does not work on Windows 8.1

I am currently taking a couple of tutorials on Pharo and I noticed that cutting and pasting code snippets from the web, pdf, notepad, ... to Pharo 4.0 was not working on my Windows 8.1 installation.

I double checked that versions 3.0 and current 5.0 exhibited the same behavior on 8.1.

I double-checked this problem does not manifest on Windows 7.

Am I the only one to experience it?

Thanks in advance,