There are four things to check that affect the way an Infopath form loads.
1) Within the Visual Studio project the InfoPath Process Integration Wizard supplies a dropdown that gives you options for infopath client, infopath client or web browser, and web browser. Make sure that this setting is set to Web Browser.
2) Within your form library, click settings > Advanced Settings > you have an option of Infopath client or Infopath Form Services
3) If the form is still trying to load in the Infopath client, open the form in design view > Tools > Form Options > Programming > If it is available click the "remove code" button toward the buttom of the form. Custom code is not supported in Forms Services. ( this can occur because of accidentally clicking "modify code" while editting rules)
4) On a rare occassion, Sharepoint may slip the wrong filename into the template field. Within the Form library, click Settings > Advanced Settings > and check to see that the form template has an xsn extension. If it has an XML extension, then the library is improperly configured, follow these steps:
- Navigate back to the form library base view (All Documents) and then switch to Explorer View (from the dropdown list in the upper-right of library)
- Open the "Forms" folder and look for your .xsn file > Copy that name to the clipboard
- Go back to advanced settings and paste the name into the template field
- Within Visual Studio > Open the Infopath integration wizard > click Design for the form in question > make a change and undo it (such as adding a space and deleting it) > Save the form and close > Click ok acknowledging that the form has been updated by the wizard > click Finish > Deploy the project
