Field Formatting tab problem in Report Writer

Hi,

Have this problem with the field formatting tab in Report Writer. It seems that the changes i make on the field formatting tab, specifically on the interface traffic fields, doesn't save even though i save it before closing. I always change the format of the said field into numeric data so that I can immediately manipulate it after exporting it to MS Excel. But when i close Report Writer and reopen it, it still has the settings on the field formatting tab on "Bandwidth" instead of "Numeric Data". This occurred only after upgrading our NPM from 8.5 into 9.5.

Hope somebody can shed some light on this :)

Thanks!

- Pau