This appears to be a regression in 10.0.18 caused by a log debug print in a function that is being called a lot! Thanks to the “Blame” feature of Git I can tell it happened while support for V-Ray Next was being added. I was also relieved to discover I wasn’t to blame
You can easily fix this yourself by
Navigating to the Repository.
Opening the \submission\3dsmax\main\SubmitMaxToDeadline_Functions.ms" file for editing.
Locating the function fn GetFormattedOutputFilename
On behalf of the Deadline development team, thank you for your patience and for reporting this regression!
We will fix it on our side for the next point release!