Are you still getting the same error in the error log when you're getting the blank screen or is there a different error? If it's the same error, can you post what you have on line 512 of the threads_import.php file?

Same error. Below is line 512

$dbh->do_placeholder_query($query,array($new_user,$user_data['U_Email'],$user_data['U_Fakeemail'],$user_data['U_Signature'],$raw_sig,$user_data['U_Homepage'],$user_data['U_Occupation'],$user_data['U_Location'],$user_data['U_PostsPer'],$user_data['U_Display'],$user_data['U_Notify'],$user_data['U_Extra1'],'',$user_data['U_Extra2'],$user_data['U_Extra3'],$user_data['U_Extra4'],$user_data['U_Extra5'],$user_data['U_Picture'],'1',$user_data['U_Visible'],$user_data['U_AcceptPriv'],$user_data['U_Title'],$user_data['U_FlatPosts'],$user_data['U_Color'],$user_data['U_TimeOffset'],$user_data['U_Totalposts'],$user_data['U_ShowSigs'],$rating,$user_data['U_Rates'],$user_data['U_PicWidth'],$user_data['U_PicHeight'],$user_data['U_AdminEmails'],$user_data['U_Hobbies'],$user_data['U_Birthday'],$user_data['U_ShowBday'],'$config['TIME_FORMAT']',$user_data['U_FloodControl']));

This bit needs to be changed:

,'$config['TIME_FORMAT']',

that, should just be

,$config['TIME_FORMAT'],