After the upgrade stopped working ... / misc / cron / archive.sh
Namely: not performed backup and update data.
If you enable archiving while viewing the statistics "- that all is well.
On 0.5.4 - works.
on 0.5.5 - not working.
The upgrade would have overwritten misc/cron/archive.sh and any changes you might have made to it in #1190.
Please post in the forum if you need further assistance.