[Plugin: cformsII] Multiple issues with checkboxes and required fields

It looks like support for cformsII has ended, and it also seems that the plugin is now no longer usable. I can’t post on the dedicated cforms forum using either Chrome, Firefox or IE, and the Delicious Days site instructs the public not to contact them about it.

I’m currently in a huge mess with a live application form.

I have a couple of forms linked together. The second one just repeats back what someone has entered in the first one, and gets them to confirm that everything is okay before submitting. There’s a back button on the second form in case they need to correct anything. I have a few checkbox groups on the first form, but if anyone clicks the ‘back’ button, all the checkboxes get cleared.

What we have now is a situation where someone fills in all the checkboxes, gets to form #2 and realises they might a slight mistake (let’s say they got their email address wrong), goes back to form #1, corrects their mistake, gets to form #2 again and sees that all the checkbox info is blank. What’s more likely is that they don’t realise that they’re blank, and, having corrected their first mistake, assume everything else is still okay, and they submit, but a lot of the info is missing.

Additionally, when any required field is not filled in and any checkbox groups have ticked checkboxes, I get a huge list of php errors:

Warning: in_array() expects parameter 2 to be array, null given in /home/[site]/public_html/wp-content/plugins/cforms/cforms.php

I’m running WP 3.8.3 with cf14.6. Anyone know why this is happening? It’s really frustrating, because it’s a long form with upload fields, so the probability of people making mistakes is high, and each time they edit their form they have to re-upload their images. Each time they upload their images their checkbox groups will go missing. It’s a potentially never-ending cycle of things getting lost, and it’s going to put people off. Not to mention how terrible it looks for the page to be filled with scary error messages.

I’m sure this never used to happen.