That would be a issue with your server, not the mod if I am not mistaken.

One question, regarding logging to a file. Shall the file be created by me, or is it created automagically by the mod? If I have to create it, what permissions are required?

The mod should not mess with your install, if there was a problem it would be from the off and not give issues later. With regards logging, the mod creates the file provided that you have permissions on your server to create the same.

With regards emails it will depend on forum usage and and your daily allowances if you're not on a dedicated box.

Please attach a txt file of the contents of your ban list an a pic of your settings, the issues you described are not or have not been reported and seem unlikely to have been caused by the mod but we'll try and help as much as possible.

I'm running it on 4.2.2 just fine.

What is Redirect URL: which url can i add ? explain please
Redirect to spiders own ip? can i tick Yes ?
Spider List : Default Use Question: Baidu (Bing.com) Yandex: yahoo.com Its mean All traffic from Bing and yahoo Banned?

Redirect URL is the url spiders will be directed to if they are in your "Spider List". If you select "Yes" to redirect to the spider's own IP this will override any url you set beneath it. You use one or the other.

No, all spider traffic from Bing and Yahoo will not be banned they are different services and have different spiders. Yes, there is some overlap in technologies used by some search engines but this will not affect you being scanned and ranked by Bing and Yahoo.

I'm not sure why you made a direct correlation between Baidu (Chinese search engine) and Bing, then Yandex (Russian search engine) and Yahoo but they are all completely different services wholly owned by different companies ...for now.

What he ^^ said :-)

No it does not. It means anything with USER AGENT STRING including Bing and Yahoo are blocked. Don't confuse this with hostnames or referrers - those aren't affected by this.

Just to be clear again BING is NOT Baidu and Yahoo is NOT Yandex, this mod will only ban a spider/bot/person if their useragent contains an entry that you have in your list.