@
faniediv - working for me, in calibre 2.2 64-bit on Windows 7
I presume the copy from external source is working, i.e. you can paste what you copy into notepad.
You shouldn't need to downgrade to 1.48, you could try upgrading to 2.2
Do you have any clipboard enhancement utilities installed - if so try disabling it/them.
How do you do the paste, with the mouse and right clicking or with a ctrl/v
If you use a mouse to do paste then this issue may be related -
2.1 - Right Click (frequently) not working - in one instance it was an Android Emulator (Handy Andy) causing the problem
BR