Hey there forrest28,
Thanks for reaching out to Apple Support Communities. We understand your photos are not loading in apps on your new Mac. We’ll be happy to help with this.
If repairing didn’t help, and Photos works fine, try booting into safe mode and see if the issue continues there. “Safe mode can help you to determine whether an issue is caused by software that loads as your Mac starts up.” You can read how to do this here:
How to use safe mode on your Mac
Also, check the Privacy preferences on your Mac and make sure Photos are enabled for these apps there as well:
Change Privacy preferences on Mac
We hope this helps. Take care.