Blank page shown on incorrect login

When an incorrect username or password are entered during login, a blank member.php page is displayed.

On some instances the following alert box message was displayed, but I can't consistently recreate it:

Error!
Your username or password was incorrect. Please try again.

Any idea how to fix this?

Thanks in advance!

Your are right ...

It has happens with me also many of my site members complained about this....

Please anyone give us a solution for this,

I can suggest to you these things :

1. Try find your trouble in site's error log file

2. Make a ticket on out support page

where can I find Site error Log file ?

Some additional, potentially useful information.

• blank page is displayed when logging in from the home page (index.php), either using the login box on the page or the pop-up login box
• alert box is displayed correctly (see attached) when logging in from the join page (join.php), both from the login box on the page or the pop-up login box

Also was able to capture this error using IE8:

Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; GTB6.6; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; MDDC; InfoPath.2; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; MS-RTC LM 8)
Timestamp: Wed, 5 Jan 2011 16:56:28 UTC

Message: Object doesn't support this property or method
Line: 6552
Char: 5
Code: 0
URI: http://grnsys.info/gzip_loader.php?file=bx_templ_js_e852f2023a63d35420fc9e0c4d7b9431.js

Any ideas?

More potentially useful information:

When logging in from member.php the incorrect username/password alert box is correctly displayed, both from the login box on the page and the pop-up login box

As a result, the problem seems to be limited to incorrect logins from index.php, while logins from join.php and member.php work correctly.

Create a ticket to support page please