# TradeStation Users - New builds have problems

**URL:** <https://forums.collective2.com/t/tradestation-users-new-builds-have-problems/1830>\
**Category:** C2\
**Created:** [December 19, 2005, 11:03pm UTC](https://forums.collective2.com/t/tradestation-users-new-builds-have-problems/1830 "2005-12-19T23:03:49Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![MatthewKlein](https://yyz2.discourse-cdn.com/flex028/user_avatar/forums.collective2.com/matthewklein/32/21382_2.png) [@MatthewKlein](https://forums.collective2.com/u/MatthewKlein)\
**Post date:** [December 19, 2005, 11:03pm UTC](https://forums.collective2.com/t/tradestation-users-new-builds-have-problems/1830/1 "2005-12-19T23:03:49Z")

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If you are using TradeStation to enter your system’s orders into Collective2 (via the c2tradestation application available at [www.collective2.com/downloads](http://www.collective2.com/downloads)), then please be aware of the following.  
  
  
  
We have evidence that TS 8.1 Build 2826 does not work. Specifically, it does not appear to send Cancel/Replace messages to Collective2 (these are used, typically, when adjusting trailing stops from one level to another).  
  
  
  
We have some limited evidence that TS 8.1 Build 3006 works fine - and specifically the Cancel/Replace feature does work.  
  
  
  
Finally, we know for certain that TS 8.0 works fine.  
  
  
  
What this means for you:  
  
  
  
If you are using TS 8.0, stick with it until we confirm which (if any) of the newest versions work, or until TradeStation gets its act together.  
  
  
  
If you _must_ upgrade to TS 8.1, make sure that you are upgrading to Build 3006 or higher. **Don’t use Build 2826, since it will probably not work.**  
  
  
  
Please post any comments or questions about this subject here.  
  
  
  
Matthew