Tooltip not showing fully - mostly whitespace

Here is an example of what I mean, the tooltip doesn't show most of the requested text ("example" in this case).

There is more information about my code in my previous question: show contour area as tooltip.

However, I made this post to address the display issue with the tooltip which is likely a broad problem.

Here is the code from the symptomatic screenshot I showed.

w = 4;
plot = ContourPlot[
    Sqrt[(x - 2)^2 + (y - 2)^2 - 5], {x, -15, 15}, {y, -15, 15}, 
    PlotPoints -> 30, MaxRecursion -> 4, Contours -> {w}, 
    ContourStyle -> Blue, ImageSize -> 250] /. _Polygon -> 
    Sequence[] /. Tooltip[x_, y_] :> Tooltip[x, "example"]  

Which can be simplified to just

ContourPlot[
   Sqrt[(x - 2)^2 + (y - 2)^2 - 5], {x, -15, 15}, {y, -15, 15}, 
   Contours -> {4}] /. _Polygon -> Sequence[] /. 
 Tooltip[x_, y_] :> Tooltip[x, "example"]  

and still have the same issue with the tooltip not showing.

I have tried adding a Pane wrapper around "example" within the argument of the last Tooltip, but this hasn't helped.