The number of sessions area in the strip at the bottom of the Fiddler window is too small. In the attached screenshot there's 932 selected sessions but the number is cut off, as is the total number. As a workaround I'm using the Request Count in the statistics window to get the selected count.
Sorry I did not see this until just now because I don't receive e-mail updates for comments. Yes on that system it is 125% display so yeah that could be it. Maybe they could make that area just a little wider. Thanks
Have you set a non-default font size in Fiddler (Tools > Fiddler Options > Appearance)?
Do you have a high-DPI display in Windows?
Disregard the blank thumbnail message. It seems to have been a temporary issue that has resolved itself.
Note the thumbnail of the attached screenshot is blank for some reason. If you click on the thumbnail it will show you the screenshot.