Usually I test qRules by putting the Command, Result and Error fields from the QdabraRules data source on my form. Preview and type GenerateGuid into the Command field. Tab out. Is there a GUID in the Result field? An error in the Error field? Is the Command field cleared?
It is easy to accidentally disable qRules in a form by adding custom code - you can use Remove Code from the Form Options > Programming and then re-inject in that case.