InfoPath Dev

I have created a Forms Document Library which I have associated with a infopath Form, when I click new I always want that form to open in a Browser..

 No problem.  It's good to know someone's reading.  You have no way of knowing my level based on one question, so the "obvious" can often be exactly what's needed.  And I probably was a little "snippier" than merited.  (Caught me right after getting smacked by someone else, somewhere else, ...

I have a form that is used by 200+ people with success. I now have 1 person who can no longer open the exiting forms or create a new one. She receives an error message that says to it is unable to open the template contact the publisher, catastrophic failure. She can open up all other forms we use with no errors, all of which were edited and ...

Very delayed response..... lol. I created a process that identify the corrupt code so we can fix so it fell way down in my priority list. still manual. Hilary, yes this occurs 100% within InfoPath code creation. We have still not been able to identify any pattern to this.

Sure, & I didn't mean to state the obvious - Hopefully the earlier poster will see your question & know which update fixed it for them. :)

My Scenario: I have a database of various IT systems. I have a SOAP API call that gives me just the entire list of system names (GetSystems). I have an InfoPath 2013 browser form, the first field is a dropdown called SystemSelect I have a SOAP API call that gives me all the metadata on a particular system (GetSystem) GetSystems is a ...

 Yeah - that sort of occurred to me already.  I was looking to see if there was an explanation of WHAT the underlying cause was.

I'm not sure what fixed the last poster's issue - but I would usually start with just making sure all updates have been installed. Have you done that? From there, I'd move on to repairing both Office 2016 & IP 2013.

 Could you share what the patch was?  Office 2016? InfoPath 2013? Both?

This is not possible, I'm afraid, not even with code. InfoPath doesn't allow changing views on a field change. Just give the user some buttons to switch views with instead.