I happened to run into this same issue last night, but with CentOS 6.5 VM's. Fortunately for me a reboot of one of the two fixed it, but it was as if the vswitch was not forwarding ARP's specific to one or the other guests. Since we had an outage as a result I unfortunately didn't have time to play with tcpdump or other diagnostic tools to try and figure out exactly what was occurring. It was very odd since both guests could talk to other guests on the same network, and the default gateway, just not each other. The guests were on the same subnet but different hosts.
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