If you install fireboard after CB 1.2 RC 2, the fields added by fireboard CB integration don't save, since comprofiler_fields.tablecolumns is empty instead of the correct column.
Please see my reply for reason, and reply to my reply for way to fix in your installation:
This issue has been addressed and fixed in Community Builder 1.2 RC 3, like all other known issues, and is available now for a last short rounds of live site testings, before CB 1.2 Stable release.