Bots are not attacking

I've got a report that bots are not attacking.
I've restarted all L4D servers to be sure.

I could not find any useful info in the log files.

Date and server time would be useful when reporting something like this.
And the name of the map (original or custom map)

Thanks

Hello,

That was happened before. What i see before: bots dont attack CI (common infected) but attack SI (special infected). If one bot is behind, 1 CI may kill him.
What was help in that situation: u was restart server. I think server version of game not loaded good, and some cwar may be set by accident to bots dont attack.

I saw this issue on the realism server,yesterday. Somehow bots weren't attacking the commons but special infecteds.
The map was MIC v2. between 02:oo AM - 4:oo AM.

I've restarted the realism server now too.
Maybe the problem it is related to one of the many custom maps we have.
Customs maps sometimes have problems with bot navigation too.