When I first posted about this back on 1/15, my only reply was someone else confirming that the same thing happened to her account.
My '/logs/xxxx.thefifthimperium.com/http/hits' directory is empty for all of my subdomains. It stopped adding files on 1/9 and somewhere around 1/20 the old files all evaporated.
I'll have to dig out one of my old archive files to see just what types of files there were, but IIRC, I had a daily summary file for each day going back to the start of my account.
I have a simple script I whipped up back in October to parse each 'bandwidth.YYYYMMDD' file for the summary line and then graph it for the calendar month and billing cycle, like I currently do for my last weeks' worth of CPU minutes on another page I have.
My access and error logs were unaffected. The missing files seemed to be daily summary files which I though were generated by Analog.