This thread in the PC Beta forum http://community.logos.com/forums/t/48540.aspx contains a detailed write-up (now with picture) of a bug that SteveF reported first in the private FSB beta forum and called a "neat party trick" - bouncing edit box on Faithlife, biblia or in L4 PC (Beta 6 Community notes).
Good that Logos re-uses code wherever possible. Developers now seem to need info on which systems this behaviour occurs - positive confirmed for Win 7 (either 32 or 64 bit) and Chrome as well as IE 8.
NB.Mick -- running Logos 5.1 Beta 8 (Verbum Master, Minimal Crossgrade) on Win7 Home Premium 32bit & some Android apps on Kindle Fire
It seems this is fixed.