Dumbdelldore,   It sounds like, from your description, to be a basic routing issue. I say that as you cant route across the switch, or communicate in separate vlans, but can speak in the same vlan, so it would have to be Layer 3.     Let me know what you see.      
We are replacing two Dell switches from "stacking" with two Dell network switches configured in "VLT" instead. Some of the devices connecting to the switch will not be configured for link aggregation (ESXi hosts, and firewall which does not support LACP), and I want to better understand how the switches handle these connections. I did a few simple tests on the new VLT switches but I can't really make sense of what is going on. If anyone can explain the below it would be much appreciated. I'm just trying to get a better general understanding of what to expect with different failure scenarios at this stage, particularly with devices not connected with LACP. Here is what I found during my testing:   If this is all as expected, I also want to avoid a situation where devices can't talk to one another due to the links being active across separate switches -- is there a way to handle this?
Basic VLT Test and Question