# UDT Binding rapidly flipping between two UDT instances

**URL:** <https://forum.inductiveautomation.com/t/udt-binding-rapidly-flipping-between-two-udt-instances/37488>\
**Category:** Ignition\
**Created:** [August 7, 2020, 2:52am UTC](https://forum.inductiveautomation.com/t/udt-binding-rapidly-flipping-between-two-udt-instances/37488 "2020-08-07T02:52:02Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![franklepkowski](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/franklepkowski/32/4808_2.png) [@franklepkowski](https://forum.inductiveautomation.com/u/franklepkowski)\
**Post date:** [August 7, 2020, 2:52am UTC](https://forum.inductiveautomation.com/t/udt-binding-rapidly-flipping-between-two-udt-instances/37488/1 "2020-08-07T02:52:02Z")

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Hi All,

I am observing some very strange behavior with a window using a UDT binding. In a client if I flip between a window using a udt binding to the same window but passing a different UDT I start getting hundreds of errors stating that it cannot write to tags inside the previous UDT that it was opened with such as engineering units (which I am not even using on the screen). On the screen with the bindings it appears the values are flipping between the current UDT binding and the one previously passed into that same window. Any ideas are most appreciated.

version 8.0.13

Thanks,

Frank

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**Author:** ![witman](https://avatars.discourse-cdn.com/v4/letter/w/d2c977/32.png) [@witman](https://forum.inductiveautomation.com/u/witman)\
**Post date:** [August 7, 2020, 5:18am UTC](https://forum.inductiveautomation.com/t/udt-binding-rapidly-flipping-between-two-udt-instances/37488/2 "2020-08-07T05:18:01Z")

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I’m not sure if your issue relates to this fix in 8.0.15, but it came to mind:

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/2/6/2617fb1c2c8b6c13059f226ca49f40813c8ac62f.png)  
[https://inductiveautomation.com/downloads/releasenotes/8.0.15](https://inductiveautomation.com/downloads/releasenotes/8.0.15)

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**Author:** ![franklepkowski](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/franklepkowski/32/4808_2.png) [@franklepkowski](https://forum.inductiveautomation.com/u/franklepkowski)\
**Post date:** [August 8, 2020, 2:19am UTC](https://forum.inductiveautomation.com/t/udt-binding-rapidly-flipping-between-two-udt-instances/37488/3 "2020-08-08T02:19:15Z")

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I performed an upgrade today to 8.0.15 and it rectified this issue. Definitely a reproducible bug.

Thanks,

Frank