Hi,
I've had this problem with the router prior, and gave up on the process. I am now trying to create a new different VLAN, and when I hit apply, the page reloads and the new VLAN is not applied. See the attached picture. Device is RV345-K9 V04 with Firmware - 1.0.03.20 and Signature - 2.0.0.0014 . Router has been updated since having this issue.
