InfoPath Dev

The other posts I found were 5+ years old and did not offer anything that helped. InfoPath 2013 - SP 2013 - No Code - Previous template published okay as a Web form - added one text field and republished with this error " An unknown error has occurred. The form template has been published to the server but it can only be opened in InfoPath Filler." I tried rolling back to the previous successful template and it now also produces the same error. Supposing it might be a complexity error, I deleted 2 views that aren't really used any more and received the same results.

In the past, I don't know who told us this, but there is an "Imaginary Threshold" of complexity that we may have passed. If we publish via CA, then the form should work. However, if I publish CA, I'll have to make this library a content type, correct (to handle the regular template and now the CA posted template and the old completed forms would continue to require InfoPath Filler)? I'd really rather just be able to publish straight to the doc lib as a Web form. Any ideas?

I usually run Fiddler and then run the design checker to see if I can get any better info on the issue (or check your ULS logs on the server). If that doesn't help, I tear the form down, saving a copy of it, publishing to a test library, and removing one view at a time. Sometimes the issue can be as simple as a bad default value, but IPFS won't tell you that....