Anyone else noticed the bug in ethminer generating DAG files? When trying to generate DAG file for any block larger than 3870000, it will only produce a 0-size file.
Try this:
ethminer.exe -D 3870000
It will run just of a few seconds, generate 0-bytes file "full-R23-3868abc5dcee2334" and exit.
This has now been
fixed by Ethereum core devs. @Genoil or whoever is still maintaining various ethminer forks:
make sure to include this patch, or else ethminers will simply "die" after block block 3870000.