Some highlights missing in text files

The search function finds the string "GEN.INV.DT" in the text files, but the found text is not highlighted and the plus/minus keys don't find the string. It will however find and highlight "GEN & INV & DT", but that's not useful because it finds and highlights every instance of "GEN", every instance of "INV" and every instance of "DT".

Windows 7
IE10

---