[rules-users] Eclipse RuleFlow editor

I'm trying to create a ruleflow in eclipse but cannot create more than one connection. I have a Start node, 2 Ruleflowgroup nodes, and an End node. Using the connection tool I can connect the Start node to the only one of the rule nodes but can't make any connections after that. I get the connection plug symbol and a circle with a slash through it. I can't connect rule node to rule node or rule node to end node. I've tried using only a start, rule, and end node but it still only allow me to connect the start node to the rule node but nothing after that. What's the trick to this? What am I doing wrong? Thanks for any help Rod