I've just released a new version which should fix issues on Kodi 18 Leia (at least for me). This also has better debug handling, so hopefully debug reports provide better insight in what's going wrong. Since I've changed a few routines as well, some of your reported issues might be fixed as well. Please all test this release and let me know if there are still issues, which can be reported by posting the log with debug option enabled.
It might be necessary to update the repository (see link below) if you've had installed it before and it's still on version 1.0.0. If you already have repository version 1.0.1, all should be fine and After Watch gets updated automatically. If in doubt, you can always just reinstall the repository zip to make sure it's up-to-date.
Current release notes
1.0.4 (2019-02-07):
* Assume watched after xx percent is working again
* Retry getting player info on playback start
1.0.3 (2019-02-06):
* Fixed bug with processing movies caused by previous update
1.0.2 (2019-02-05):
* Implemented debug class providing better in-depth debugging
* Catch division error or other exceptions on playback stop (noticed on Leia)
* Turn off display on Linux supported when CEC available and cec-client installed
* Option to auto close confirmation dialogs after set period
* Other small fixes
Previous release notes
1.0.1 (2018-11-01):
* Follow symlink when deleting files
Latest repository (recommended way of updating):
https://github.com/jvandenbroek/jvandenb...-1.0.1.zip
Direct add-on download:
https://github.com/jvandenbroek/jvandenb...-1.0.4.zip