Tom is correct, the SA520 has four ports on the inside, two will need to be access ports only. One in each VLAN with either PCs or Switches on each of the ports for each subnet. Otherwise all inside ports are Trunk ports and any computer plugged directly into any of the four "Trunkports" on the SA520 will not forward traffic to the SA.
To test you'll need to place one port in Access Mode assigned to each VLAN then plug your PCs one into each port making sure the network cards are assigned IP addresses correctly or by letting DHCP assign them if you have it configured on each VLAN subnet.
Once done this way each PC should be able to ping the other thru the SA520 and Ping each interface assigned to the SA520. Which makes me wonder you did assign the SA520 an IP address on each VLAN subnet?
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