backfill for crude spreads

Hi,

I’m using Rithmic and few months ago i started watching spread contracts. started with crude oil spreads.
Up until 2 months ago when ever I opened a crude spread chart, I got backfill data, but couple of weeks ago I tried to rollover few of them and check other spreads… but no backfill data comes thru and only real time print works.
Please check this out.

Thanks