Version:           2.2.2 (using 4.3.90 (KDE 4.3.90 (KDE 4.4 RC1)), Mandriva Linux release 2010.1 (Cooker) for i586)
Compiler:          gcc
OS:                Linux (i686) release 2.6.32.4-desktop586-0.rc1.1mnb

Assuming my system is up to date as soon as upds ate are available, I think that this is due to latest amarok release but I cannot be sure, I cannot say the exact moment when this bug appears but it's a few days old. I haven't installed new scripts, and nothing changes in my amarok configuration. I do not have a scrollbar for the lyrics script, this is kind of annoying because I only have acces to the first lines of lyrics.

I use Ultimate lyrics script and it seems to be up to date (the checkbox in order to maintain it up to date is checked.)