Error on admin panel

[smartgrafik]

Hi there,

after loggin to admin panel I get this error:

Fatal error: Unknown: Cannot use output buffering in output buffering display handlers in Unknown on line 0

After refresh browser, I can login.

How to fix it?

Regards,

[JLHC]

Is this a fresh installation? What version of Magento are you running? Do you see the problem every time you login? 

Something is turning on output buffering: http://php.net/manual/en/function.ob-start.php

You may be getting some other errors like the "out of memory" but as buffering is on, the error may not be shown. 

[smartgrafik]

Hi there,

I am using Magento 1.9.1.0

At first blank page, after refresh I get this error:

Fatal error: Unknown: Cannot use output buffering in output buffering display handlers in Unknown on line 0

Regards and thanks,

[JLHC]

Is this a fresh installation? Did you do anything before the error happened? 

[smartgrafik]

Yes, I installed my store before 2 weeks.