My response about what was in %query was based on the line above

LoginUser($dsn,$sql_username,$sql_password,$sql_user_table,$sql_sessio
+n_table,$passhash,$sessionhash,$uvId,$username,$ipaddress);
[download]

that i took to be the call to this subroutine.I had counted the args and determined it was even so your "even-sized list expected" message made me wonder, so I searched other posts of yours and found much to my surprise that that the actual calling code seems to be

my ($result, $login_timeout) = LoginUser($query);
[download]

A hash, (something starting with a % sign, or used as $something{...}, or $something->{...}) can be thought of a special array with a even number of elements and the odd numbered elements have special magic associated with them. This allows you to assign an list to them like %hash=('a','b'); or often seen as %hash=(a=>'b');. A reference to an @array is seen as a list, and here @_ is an array of the arguments to the call, so %query=@_; qualifies as assigning a list to a hash. but the list needs to have an even number of items in it to properly make the hash work. when use warnings; is in effect you get an warning if a list assignment is made to a hash and the number of items in it is not even, as you now have seen. Warnings do not stop the program tho.

I still stand by my assertion that you do not understand what is in %query, in a similar call

use CGI; 
my $query=new CGI; 
test($query); 

sub test { 
my (%query)=@_; 
use Data::Dumper; 
print Dumper(\%query); 
}
[download]

Dumper shows

$VAR1 = {
          'CGI=HASH(0x3f7e24)' => undef
        };
[download]

Which is not what you expected at all is it? Based on seeing that the actual call is

my ($result, $login_timeout) = LoginUser($query);
[download]

and that you never use the %query hash i suspect that when you said my (%query) = @_; you really wanted my ($query) = @_; That sets the localized scalar variable $query to the first argument of the call rather than trying to set the hash %query to the entire argument list. It also matches your call better and creates a localized $query variable to use in the LoginUser subroutine based on the arguments to the call rather than using the $query variable set somewhere else.

as i noted warnings do not stop execution and i dont know what you mean by "derails code to determine if already logged in"

as to why "the warn( in my cgi scripts do not print in the error log" i cannot answer, mine do, and a google search has produced no further answers either.

as you see debugging by proxy can be a real pain, even more so for me when you only release code in little pieces, spread across many threads. I understand your frustration, do you understand mine?

I understand debugging old code, both of mine and that from someone else. i stand by my previous statement "You need to step back and look at what is really going on, not what you think is going on."

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