Has this persisted across multiple versions of LR? I couldn't quite figure that out from the initial post. If not I would initially suspect Video drivers, or a hardware problem in the video card, but it seems to be the same across two different computers. Did you by any chance install LR on to both computers from the same download file? Because my next suspicion would be that you used a slightly corrupted download to get the same error on to both computers. The customisable nameplate is not normally shown in that location. The nameplate is at the very top, in the left hand corner, where you can change the Lr "icon" and replace the version name with custom text. I keep intending to make an icon in the LR colours, with my initials to use up there. What I would suspect, and that is composed of a transparent text box is the information display. In this case you seem to just have the file name on display. The Information section though can consist of up to three lines of text. The top one in that large font size, and the other two in a font size that is about 1/3 smaller. You can cycle through three options for the information using the I key, there are two different sets of information shown and off. If you are in the Library module and right click (Opt click? in OSX) and select view options at the bottom on the options list you can change the information that is included in Info1 and Info2 in the Loupe tab. I would suggest changing these to see what effect that has on the problem.
Alan