UR 4.1b does not keep/accept registration info

[Yanni]

Yesterday I downloaded UR 4.1b and installed on top of the previous version (4.1a). UR lost the registration info, and copying and pasting it in Help | Register... was not accepted ("The name and/or key entered is not valid!)"

(Lenovo Thinkpad T61, WinXP SP3) If this is not a general bug introduced in the latest version, I can send more system info. Others noticed this?