Suddenly stopped processing Downloads folder

Hi,
I've been using Hazel for a year or so (maybe longer) and I've had no issues with it. I have a couple of rules that monitor my Downloads folder and moves things around. For the last 48 hours these rules have not run. The last entry in the log for any action on the Downloads folder is from 25th June at 14:03 BST. All other rules are still processing and moving files just fine.
Anyone any idea what could have caused this change? I've disabled the rules and stopped Hazel. Then re-enabled them and restarted Hazel but with no effect.
I've been using Hazel for a year or so (maybe longer) and I've had no issues with it. I have a couple of rules that monitor my Downloads folder and moves things around. For the last 48 hours these rules have not run. The last entry in the log for any action on the Downloads folder is from 25th June at 14:03 BST. All other rules are still processing and moving files just fine.
Anyone any idea what could have caused this change? I've disabled the rules and stopped Hazel. Then re-enabled them and restarted Hazel but with no effect.