On the summary page it says for hosts updates:

2015-03-17 17:35:25 GMT (18:12:01 old)

If the routine of ones per 24 hours, sometime this evening, 23:59 maybe a new run would happen... don't know. He posted something about operating cost few days ago, mentioning the very one time per day: http://boincstats.com/en/forum/1/8369,1#135315

Yes, because something went SNAFU (System normal all frequently updated), except a large part of the hosts.gz file was seemingly not imported... no import, no record, no stats. Maybe something timed out or the disk is chock full, considering the compressed file is already 389MB, see http://www.worldcommunitygrid.org/boinc/stats/. That takes a bunch of space in decompressed state.

Latest BS WCG summary scrape shows

2015-03-17 17:35:25 GMT (23:02:02 old)

Maybe in another 2 hours things return to at least show the lost devices again [and then be shown with the suspected ~1.3M active devices instead of the proper 250K.]

Frequency, the post by Willy highlighted that some want it more frequent, butt cost is prohibitive. Default BOINC projects export their data 4x a day [last for hosts was 12:36 UTC and next will be around 18:36], it then being up to the statistics sites to choose how often they want to pull the data [4xday is 1.6GB :O]. During the 10 year anniversary challenge WCG even exported every hour so the SETI team could give very frequent competition progress refreshes.

The installed hosts now dropped from 1.2 million to 0.6M, another slash in half and only 2213 active hosts left... not looking good, at BS.

Though this has been ongoing now for several days, Nobody is commenting at their forums in either the BOINCStats or BAM sections.

Hello all -

I have notified the tech team of this issue.

Thanks,
ErikaT

My missing hosts just reappeared again. Funny, in order to keep statistics consistent, they have now daily, weekly and monthly credit equal to total credit. I wish to have a machine capable to crunch 1,042,728 points per day ;-)