Did some testing - Blessn900 is NOT the culprit. It is the fcam-drivers that Blessn900 pulls as a dependency and was developed as part of the Fcamera program.

Test consisted of uninstalling Blessn900 and fcamera and fcam-drivers, rebooting and then using stock camera. Next installed and fcamera (it pulls fcam-drivers) and rebooted. Used stock camera. Outcome evident at this point.

Exposure of stock camera was well balanced without fcamera but evidently washed-out when photo taken after fcamera install. QED.

Damn! Solution will not be simple. Both fcamera and blessn900 expose correctly using fcam-drivers as is....