One issue I have seen is that I have to open Internet Explorer and make sure I am signed in before I try to publish from InfoPath.
Another thought is that Microsoft pushes updates to Office 365 and sometimes these can cause unexpected issues. To verify whether it's an issue with qRules or with the specific form, can you try the following?:
1. Create a blank, new browser form
2. Inject it with qRules
3. Set up a very simple command (or two), perhaps GenerateGuid.
4. Publish the form to a new Office 365 form library.
5. Open the form in the browser and tries the command(s) you set up.
If this all works, then at least we know it's an issue specific to the form.
If this all fails, then we know it's related to qRules on Office 365.
Let us know how it goes. Thank you!