Changes in linux are not reflected in windows for some time and vice versa

[Humphreybas]

Ubuntu 16.04 and Windows 10 dual-boot.
Version 0.69 installed on windows, ext4 drive mounted as fixed hdd (registry).
Write cache in Ubuntu is turned off.

Steps to reproduce 1:

1. In linux/windows, place file on drive
2. shutdown linux/windows
3. start computer again but now select windows/linux in boot menu
4. browse to folder
   expected: see the file
   what happened: file not there

Going back and forth between OS's didn't really help. But the next day suddenly the file appeared where it should have been in windows.

What also happened: I downloaded a file in linux, it wasn't there in windows. But when I got back in Linux, the file was also missing there suddenly.

(To the contributors: thanks for this nice software!)