Rules do not execute

hi guys, i have rules within a folder and subfolder that are shown as "rule matched" in the preview, but the don't run!
log says: "2016-03-08 14:38:08.174 hazelworker[5703] Another hazelworker process is processing folder with identifier 16777218-38651043. Exiting."

any idea?

That indicates Hazel is already running on that folder. You should check through the rest of that log to see what is actually going on. You can email the log in to support if you want me to take a closer look at it.

I'm having a similar problem with a system that was previously working fine. After a reboot everything went haywire. Was there any progress on this?

There is no identified problem here. You need to provide more details.