I'll try and help here. Just a couple of things I noticed.
1) The machine with the IP address for VLAN 2 should be connected to a network port on the RV345 where VLAN 2 is set as _Untagged_. (Unless the machine tags itself with Vlan 2 - some servers can do this)
2) Regarding being able to ping the router, it's not unusual for the router to respond to pings for any configured IP address it has.
Be sure that the Gateway address is set properly on each of your end devices (and in your DHCP scope)
192.168.0.1 for Vlan 1
192.168.50.252 for Vlan 2
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