Hi,

your suggested fix looks technically OK - but its normally not possible that the Root.Manager property is null during the load of the XML Layout. Its therfore, likely that you have a timing/synchronization problem and the root cause is somewhere else :-(

I seriously wonder if you have the same issue as reported by @Muhahe in issue #38.

The analysis already states that the DispatcherPriority.Background priority is needed to deserialize succesfully. The issue reported is the same as your issue but based on a different workflow.

Can you please check and maybe work with @Muhahe to come up with a better fix? One, way I could think of is to load the XML from file system in a background thread and give it to AvalonDock (as string) with the DispatcherPriority.Background. Thats not a simple fix but should work as it does in other test apps - but it should be much smoother since the UI does not have to wait t´for the filesystem...

Querstion: Would a solution like this work for you and maybe even @Muhahe?

Hi @Dirkster99 , thanks for your prompt response. I will look into this and consider your proposal (it would certainly be OK as far as I am concerned) but it will a while, cause I will be away for a couple of weeks. I have to confess I did not do a lot of looking, but rather noticed the exception, added a null check and found it was fixed. I'll try to find time to create a better fix as you suggested.

Version 3.5.10 and later will include the suggested solution