Avast 17.3.2291 issue logitech c525

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We have an issue with this update and logitech c525, when we execute our app using directshow library the image is complete black, but in the logitech software and skype image is visible and clear.
We uninstall avast and everything works fine, we add some exception to the directory route and exe but nothing change.

Thanks in advance for your help.

[Eddy]

What OS/SP ?
What exact avast version ?
What shield is causing the problem ?

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Hi i have the same problem, I work with WIndows 7 x64 and Windows 10 x64
The problem is that dont show any webcam using Direct Show.
The problem started on 28 may of 2017 i think that with an update after midday

Avast doest now show anything but in passive mode , starts working all again (i have to restart the pc).
if i unnistall avast and restart the pc all start working again.
Any application working with directshow does not work Probably written in c# .net winforms or wpf (i have tryed both).

Here its a code with binary excutable example https://www.codeproject.com/Articles/671407/Camera-Net-Library

Binary https://www.codeproject.com/KB/audio-video/671407/Camera_Net_Samples._Compiled.NET4.__v1.1.2_.zip (you must to get login in codeproject)

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The only way to get webcams working in many programs is to place Avast in "Passive Mode" or uninstall. This seems to be a consistent issue, but has not attracted dev attention.

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What OS/SP ?
What exact avast version ?
What shield is causing the problem ?

OS is W7.
Version of Avast is 17.3.2291.
And all shields are active.

We have 18 PC's with the same issue.

The only way as i read is place in "passive mode" or uninstall, but we want to keep the antivirus full work.

Thanks for your reply and help