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Are you using QuickBooks online version? If yes, please follow this guide. ADOBE or ADOBE compatible PDF reader is required to print checks correctly.

QuickBooks Online Check Printing: PDF Driver Settings
https://www.halfpricesof...line-checks-printing.asp 

If you still see this issue, please feel free to contact us again. We will support further.

If you have further questions, please contact us directly at services@halfpricesoft.com
Small business payroll & tax software solution
http://www.halfpricesoft.com 
Hello,

I'm using your DEMO version to test to make sure I can print a blank stock check from QB online. Everything is setup in your program and the test check works great. When attempting this using a real check in QB online I get to the very end and it gives the following error:
Not valid Check Format.

Can you assist me with why this is happening?

Thanks!