Steps to reproduce:

1. I have a log file App.log on E:\ disk.
   Created 2 items (zabbix agent active):
   1) Log monitoring, key: Log[E:\Temp\App.log,ERROR]
   2) Check for file existance: vfs.file.exists[E:\Temp\App.log]
   vfs.file.exists[E:\Temp\App.log] - shows "1" in Latest data.
   Log monitoring item - never get updated. I manually add Error string in log file, but it never get updated for item data.
   When I changed log file location to C:\ drive (C:\Temp) - only then it started working for log monitoring item.

Result:
See log file.

As you can see from log file it sends value "null" for log item.
Expected:
Should just work.