Hi @bruce t thanks for posting in the community! Just to confirm my understanding when you use the blue squares to resize your shape it's adding a connector instead - is this correct? 

As a first step could you please try this in a private or incognito window to help us narrow down the potential cause? For help with opening an incognito window please see this community post. For more information on shapes in Lucidchart I recommend taking a look at this Work with Shapes article from the Lucidchart Help Center. 

Thank you for your help and patience. Please let me know if you see any improvements after trying this step!