So when we upgraded from v4.8 to v5, our TreePanel completely disappeared and we cant figure out why.
There are no JS errors or anything amiss.

We verified that the JSON is returning properly by using fiddler.

We did find a odd bug in ext in that we build our JSON on the controller side and set Icon=Icon.Group or something like that.

Now the JSON that is generate is invalid and JSONLint wont validate it.

"iconCls": X.net.RM.getIcon("Group"),
Now when this occurs, we added a debugger to the Load event of the store and success is true and records.len=0

We comment out all the .Icon assignments in the controller and success is true and records.len is proper size.

However in both cases, the TreePanel is completely blank. And we have no errors.

I need some assistance on this one but it might require a offline screenshare. I dont have any standalone example to share

thanks
/Z