After opening an image in repub, sometimes end up with a blank

In humber_etc_25, I haven't seen it elsewhere yet, if I double click in the preview window to open an image, then click the image to bring it up to 100% size, click again to shrink it to fit the window, I end up with a blank screen.

If I then close that window, and double click the preview to bring it up again, the image doesn't reappear, it's still blank. I have to deselect the image in the main window, select another, then go back to the original in order to open it up again.

First time I've seen it, in this reel. haven't noticed it elsewhere. Will update this if I see it again.