Apparently... 
So although I found the node-red-contrib-amqp reference in the .config.nodes.jsonfile:
"node-red-contrib-amqp": {
"name": "node-red-contrib-amqp",
"version": "1.0.2",
"local": true,
"user": true,
"nodes": {
"amqp": {
"name": "amqp",
"local": true,
"user": false,
"module": "node-red-contrib-amqp",
"file": "\\Users\\ItayKishon\\.node-red\\node_modules\\node-red-contrib-amqp\\lib\\amqp.js"
}
}
}
, the folder itself doesn't exist.
Removing the above reference from .config.nodes.json solved the issue, and the system has loaded. And may I add - with all my previous flows, as this was obviously not a completely fresh install...
Now everything is working again. I wonder - has the invalid node reference caused the loading problem?
