[Discuss-gnuradio] Questions on rx_ofdm example in GR 3.7.1

[Monahan-Mitchell, Tim]

GR 3.7.1
gr-digital/examples/ofdm/rx_ofdm.grc

1. The OFDM Frame Equalizer block that is downstream from the Header Stream 
Virtual Source block has the Length Tag Key field set to length_tag_name, yet 
all other blocks on the diagram with that field are set to length_tag_key 
(which is the ID of a Variable block at the top of the diagram). Is that a 
mistake? If someone will confirm, I can file the bug.

2. When I try to run this flowgraph, modified for my target's custom source 
block, I get this error:
FATAL: Missing a required length tag on port 0 at item #0
thread[thread-per-block[21]: <block ofdm_frame_equalizer_vcvc (22)>]: Missing 
length tag.

Which led me to question (1) above. However, changing that block to match the 
others does not correct the runtime error.

I found a couple of instances of the same error listed in (2) above in the 
mailing list, but no one replied to them.

TIA,
Tim