Hi Brian
Yes it does seem to be related. Tried starting b81 with logger off and the logfiles ran. Turned data logger on again (no restart) and logfiles stopped. Back to OFF and all OK. Would disabling the faster routine mean I would lose data if wd was shut down for an extended time. If I start b81 with the logger on then do a quick restart with it off the logfiles work after two minutes. I could live with that.
Regards
Alan