Yes, I'm experiencing this problem too.
I have about 15 HD 1010s, and most of them are working fine - I'm connecting to them via local networking, and pushing presentations up just fine.
Three of them are having problems though. I can ping them, and I can view the web interface fine, but BrightAuthor can't see them. I get the error stating 'no brightsign at that address'. This is with the 3.7.54 firmware and the 3.7.44. The other working units are attached to the same switch, on the same LAN, and are running the 3.7.44 firmware.
If I format the SD card and set up the unit from scratch, I'm able to access them via local networking. I'm able to push an update up, but after an hour or so, they stop responding via local networking. I can still ping and view the web interface though.
Rebooting the unit doesn't resolve the problem, leading me to think that maybe the SD card is filling up or something?
edit: unfortunately not:
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/sda1 3864064 140480 3723584 4% /storage/sd
I'm really puzzled, and would really appreciate some assistance.