Won't create full backup after differential backup

Hello Greg!

Welcome to Acronis Forum, we are glad you joined us!

I appreciate you found time to share your experience with us and will be glad to help you. Unfortunately due to the lack of diagnostic information it is difficult to identify the exact cause of the issue. I would suggest you though to try the following: 

1. Delete the tasks as mentioned in this KB article
2. Update the Scheduler
3. Recreate the task

This may help to resolve the issue you've faced.

Should the problem be present, please obtain the following diagnostic information:

1. Acronis Info
2. Screenshot of the backup location
3. Screenshot of the backup settings

After that please kindly contact support directly with the information attached. Keep in mind that should there be any procrastination with the reply, you can always specify us the case number. We will do our best to speed up the process.

Should you need anything else or have any further questions - feel free to contact us at your earliest convenience, we will be happy to help you!

Thank you!