displaying GString data

[Rob Clack]

I'm using ddd 3.3.9 to debug a C program, and want to display the 
contents of a GString, but I don't see anything.  I click Display and a 
box appears in the data window, containing the correct variable name and 
the pointer to the structure, but if I rightclick the pointer and select 
Display from the drop-down menu, instead of seeing my data, I see a tiny 
black rectangle inside another box.

I know ddd understands GStrings, because it all works in the console 
window:

(gdb) p *source
$1 = {str = 0x8197528 "genomic_canonical", len = 17, allocated_len = 32}

I assume I'm doing something wrong, but what?  I've tried looking in the 
archives, but the postings seem all to be spam.

Thanks
Rob