Batch jobs producing unreadable & unwriteable files, Error Code -36

[adiaz]

Affinity Photo Desktop 1.10.5 on Big Sur 11.6.8

Running a simple batch job where I'm basically just adding an adjustment layer preset to a bunch of .afphoto, then saving as .afphoto in a new folder. Turns out just fine except for a file or two:

• no thumbnail preview which is the giveaway that something didn't turn out right
  • 
• the files fail to open and Affinity Photo says they're already open in another application
  • 
• machine is unable to erase the file and returns Error Code -36.
  • 

I can get the results I wanted with a simple workaround, but it's an extra step and kinda ruins the file organization flow I had going... Is there a way I should be running batch jobs differently to avoid this? Does this suggest a hardware issue?

[Old Bruce]

Try turning off the Parallel Processing in the Batch dialog. Down at the bottom left corner.