I've run into this wee problem just in the last several days. Let's say I have a translation of the Bible open in one pane and a commentary in another.
When typing in say, Proverbs in either the Bible version (window) or the commentary, I can get the P in ok but it takes a second or two for the following letter "r" to show up. Each letter is jumpy and takes a bit to show up.
This doesn't happen in any other program. If I close down Logos and bring it up again, everything works well for a little while but the problem comes back again. I've rebuilt the Index but this doesn't do anything to permanently fix it either.
Is this a bug or is there something else I should do to overcome it.