Font size suddenly changed in side bar and widgets/only certain ones

I just recently yesterday recieved a few email and a couple of support complaints about text on side bar and in widgets suddenly decreasing in size.
First thought, and after search on here was that a plugin was interferring. So I de-activated every plugin and still doesnt fix anything. Slowly am adding every plugin back in hopes that one may trigger something, but will all plugins deactivated, and the most recent 3 that were added over the past 4 days completely deleted and removed its still a no go.
Its only on a few blogs. For example this blog the text is reduced in size.....
However on the main blog it is not as in

Im at a complete loss, have been searching forums and across the net for 18hrs strait now to no avail.
Any idea's or has anyone seen this happen previously?
Bill H.