Well, there are a couple error codes that indicate that TWS or the client API are out of date:
- 357??? Your client version is out of date.
- 503??? The TWS is out of date and must be upgraded.
Any chance you get one of those?
There have been a few API changes lately, such as increasing size fields from int (lots or 100) to long (shares) in 985 that may require a more selective version combination between client and TWS.
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