FTP settings won't save

[Glorious1]

When I make changes to Services > FTP, then hit Save, the animated wait circle comes up for a split second, then disappears. When I go to another screen and come back, the settings are reverted, save didn't work.

In other services, the wait circle spins for several seconds, and settings stick.

 

[Heracles]

Hey @Glorious1,

First thing would be for you to provide all the details about your setup : Hardware and software version...

 

[Glorious1]

It's in my 'Show' button but I know some mobile browsers don't see that.

Motherboard: SuperMicro A1SRi-2758F mini-ITX with integrated
CPU: Intel Atom C2758 CPU, 8-core 2.4 GHz
HBA/Expander: LSI 9240-8i PCIe board flashed to IT mode, provides 8 SATA ports
RAM: Crucial 2x 8GB SO-DIMM 204-pin Unbuff. ECC DDR3-1600 1.35V
Drives: 3x WD Red NAS 3 TB, 4x WD Green 3 TB
Power Supply: SeaSonic Platinum Series SS-400FL2 Fanless, Active PFC
Case: Lian Li PC-Q26 with 5x 120-mm fans and room for 10 3.5" drives
FreeNAS: FreeNAS-11.3, four disks in RaidZ1 (remaining disks for backup)
Boot Device: Transcend '32 GB' SSD