I just updated to 2018.4 but using the input tool I seem to be missing network drives, there's also some showing that I do not have mapped. Even if I use the recent list to browse it claims that the drive doesn't exists when Explorer clearly shows it as a mapped drive.
I'm missing my O, R, W and X and Alteryx has a mapped S,U and V drive that don't actually exist. Seems like some old cached network list from long ago.
