# Unexpected behaviour when opening devices with .NET API (socket driver)

**URL:** <https://forum.commonvisionblox.com/t/unexpected-behaviour-when-opening-devices-with-net-api-socket-driver/861>\
**Category:** .Net API\
**Created:** [August 29, 2019, 12:11pm UTC](https://forum.commonvisionblox.com/t/unexpected-behaviour-when-opening-devices-with-net-api-socket-driver/861 "2019-08-29T12:11:45Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![rtp\_derahs](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.commonvisionblox.com/rtp_derahs/32/79_2.png) [@rtp\_derahs](https://forum.commonvisionblox.com/u/rtp_derahs)\
**Post date:** [August 30, 2019, 7:48am UTC](https://forum.commonvisionblox.com/t/unexpected-behaviour-when-opening-devices-with-net-api-socket-driver/861/3 "2019-08-30T07:48:32Z")

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Hi @MarSch,

This sounds like a bug in the CVFactory.dll we had in an older Version of CVB which should have been fixed for 13.02…

[https://forum.commonvisionblox.com/t/opening-multiple-devices-at-the-same-time-no-stream-for-3-devices/817?u=rtp\_derahs](https://forum.commonvisionblox.com/t/opening-multiple-devices-at-the-same-time-no-stream-for-3-devices/817)

Could you please tell me the file version of your CVFactory.dll? It is located in the installation directory of :cvb:

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