gogle translate
--------------------------------------------
When you go to the version of Zabbix 1.8.13 to version 1.8.12 can not get access to the WEB-interface. Does not appear even prompted to enter your login and password.
When translating Zabbix mode «Maintenance» situation has not changed.

I have constantly active users ~ 5, plus two user API, through which work almost all the scripts of interaction with the equipment.
Chance «memory_limit» is set to 256MB. When replacing the 538Mb on the situation does not change.
When replacing the WEB-interface to version 1.8.12 of the access to Zabbix appears.

An analysis of the problem, I discovered that the version Zabbix 1.8.13 has been replaced by the function «logout» in the file «class.cuser.php» from the API.
When replacing this function to a function from version 1.8.12 to 1.8.13 interface became fully operational.

If I understand correctly, the interface stops coming here at this place:
catch (APIException $ e)

{ self :: EndTransaction (false, __ METHOD__); $ Error = $ e-> getErrors (); $ Error = reset ($ error); self :: setError (__METHOD__, $ e-> getCode (), $ error); return false; }

When adding a print_r ($ session) after this code, I hope nothing has beguiled, was loading in IE9 HUGE amount of data, while I was not interrupted by ~ 30 seconds.
File «sessions.ibd» Zabbix in the database the main server is now «18432K».

PS: On a test server Zabbix 1.8.13 with virtually an empty database, and no changes to the file «class.cuser.php» normlno works. The file «sessions.ibd» test server is now "458 752".

original
--------------------------------------------
??? ???????? ?? ?????? Zabbix 1.8.13 ? ?????? 1.8.12 ?? ???? ???????? ?????? ? WEB-??????????. ?? ?????????? ???? ???? ? ???????????? ????? ?????? ? ??????.
??? ???????? Zabbix ? ????? «Maintenance» ???????? ?? ????????.

???? ????????? ???????? ????????????? ~5, ???? ??? ???????????? ??? API, ????? ??????? ???????? ????? ??? ??????? ?????????????? ? ?????????????.
?????????? «memory_limit» ??????????? ? 256??. ??? ?????? ?? 538?? ???????? ?? ????????.
??? ?????? WEB-?????????? ?? ?????? ?? 1.8.12 ?????? ? Zabbix ??????????.

? ?????????? ??????? ???????? ? ?????????, ??? ? ?????? Zabbix 1.8.13 ???? ???????? ??????? «logout» ? ????? «class.cuser.php» ?? API.
??? ?????? ?????? ??????? ?? ??????? ?? ?????? 1.8.12 ????????? ?? 1.8.13 ???? ????????? ???????.

???? ? ????????? ?????, ?? ????????? ?????????? ????????? ??? ? ???? ?????:
catch (APIException $e)

{ self::EndTransaction(false, __METHOD__); $error = $e->getErrors(); $error = reset($error); self::setError(__METHOD__, $e->getCode(), $error); return false; }

??? ?????????? print_r($session) ????? ????? ??, ???????, ?????? ?? ???????, ??????? ???????? ? IE9 ???????? ?????? ??????, ???? ? ??? ?? ??????? ????? ~30?.
???? «sessions.ibd» ? ?? Zabbix ????????? ??????? ?????? ????? «18432K».

P.S.: ?? ???????? ??????? Zabbix 1.8.13 ??????????? ? ?????? ?? ? ??? ???????? ????????? ? ???? «class.cuser.php» ???????? ????????. ??? ???? ???? «sessions.ibd» ????????? ??????? ?????? ????? «458752».