Not sure if I am running into a bug or what. I created a custom check form and assigned it to the check transaction. I fill out the info and hit save. When I edit the transaction, the form flips back to the default standard form but the form is set to use the custom one due to the PDF printing. So it appears its the custom form but editing flips the form even if you dont save. This causes the check writing process to print the default form. I created a NEW check transaction and set the form and it printed just fine. There's no other customizations on this record. Am I going crazy?

Did you check any defaults in accounting preferences ?

If its pref based, its one I've never dealt with (or remember dealing with at least). A new transaction seemed to fix it so something must have gotten messed up somewhere. It is still reproduceable on the old transaction though so I may log it for netsuite support just for curiousity.

bit of a stab-in-the-dark™, is it to do with the "store form with record" option?

I'll have to check and see. I didn't make any updates to the form but that def doesn't mean someone else did. It def sounds like it

I had something like this on a client account three years ago. I don’t think I ever resolved it and maybe I game them a link with &cf= My case had to do why requiring a specific date format to print on Philippines Cheques. Enough pain to remember it wasn’t intuitive.