Hi David,
Thank you for your detailed information.
I am afraid that I was not able to reproduce the issues you have mentioned here.I have tested the above listed issues with the Diagram Builder sample and my application is working fine for me as expected.
In regard to the LinkTool dragging over the symbol issue, I have attached the sample images for your reference.Please refer the attached folder.
Regarding the LineRouting and LineBridging issue, you can find link lines route around the nodes for the orthogonalLinks.The standard routing strategies can be modified by sub classing the default line router to suit your requirements. Please refer the following link to get an idea on this feature.
http://www.syncfusion.com/Products/features.aspx?t=589
Also,with the symbol movement issue , the connected symbol gets moved quickly.Could you please let us know the version you are using ,since we were not able to reproduce the issues with the latest version samples?.
Please do contact us if you need any further assistance.Thank you for all your efforts.
Regards,
Praveena
SampleImages0.zip