flv container - ADM won't release handle

[andrewk8]

Using ADM 2.6.19 x64 on Windows 10 x64.
This problem only happens with .flv containers.  Doesn't matter what the audio / video stream is inside the container.  Here's a sample container info from MediaInfo.  Happens regardless of the "Tagging application", too.  Every .flv file is affected.

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Format                                   : Flash Video
Tagging application                      : flvtool++ (Facebook, Motion project, dweatherford)
When I edit a .flv file in ADM, and close the file.  I am unable to delete the original with Windows Explorer.  Message is:

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File in Use
The action can't be completed because the file is open in Avidemux 2.6.19
If I exit ADM, then I can delete the .flv file.  File handle unlocking tools like Unlocker, LockHunter, etc. also work.  Neither are convenient.
Doesn't happen with other containers (mp4, mkv, avi, mpg).

[Jan Gruuthuse]

Most likely this is Operating System related / Anti Virus caused. And not avidemux related.
See replies below.

[mean]

Did you use file-> close ?
Might be a file handle left open

[mean]

confirmed

[mean]

fixed