Output to CSV does not retain

Since our upgrade to v10, we have several scheduled reports in LBI that are not retaining their output type settings. One specific report is set to save in CSV format in the Report Options, with the default Output Type saved as Comma Separate Values (CSV) and only Comma Separated Value is checked in "Allowed Output types". Yet when the report runs on the schedule, the scheduled instances are generating in RPT format.

I've tried deleting the schedule and adding back in, deleting the report and starting over, with the same result.

Has anyone else encountered this and found a solution?