SEARCH operation is a no-op on all pages except the first for no reason

Question

I have tried everything. I have an application made of up of several read-only reports, one per page. Each page has a report region of type SQL Query (PL/SQL Function Body Returning SQL Query). The first page I did works beautifully. I have a Search item P1_REPORT_SEARCH that is incorporated in the Region Source:
declare
l_sql varchar2(32676);
begin
l_sql := 'SELECT
"SW_AUDIT_GAP_ANALYSIS"."PROD_FAMILY" "PROD_FAMILY",
"SW_AUDIT_GAP_ANALYSIS"."PROD_CLASS" "PROD_CLASS",
"SW_AUDIT_GAP_ANALYSIS"."ROS_COUNT" "ROS_COUNT",
"SW_AUDIT_GAP_ANALYSIS"."OTHER_COUNT" "OTHER_COUNT",
"SW_AUDIT_GAP_ANALYSIS"."TOTAL_INSTALL_COUNT" "TOTAL_INSTALL_COUNT",
"SW_AUDIT_GAP_ANALYSIS"."PURCHASE_COUNT" "PURCHASE_COUNT",
"SW_AUDIT_GAP_ANALYSIS"."VARIANCE" "VARIANCE",
"SW_AUDIT_GAP_ANALYSIS"."KNOWN_LIC_COUNT" "KNOWN_LIC_COUNT",
"SW_AUDIT_GAP_ANALYSIS"."COMPLIANT_STATUS" "COMPLIANT_STATUS",
"SW_AUDIT_GAP_ANALYSIS"."COMPLIANT_STATUS_VERIFIED_BY" "COMPLIANT_STATUS_VERIFIED_BY",
"SW_AUDIT_GAP_ANALYSIS"."COMPLIANT_STATUS_COMMENTS" "COMPLIANT_STATUS_COMMENTS"
FROM
"SW_AUDIT_GAP_ANALYSIS"'
l_sql := l_sql ||' where ';
l_sql := l_sql ||' (
upper("PROD_FAMILY") like ''%''||upper(:P1_REPORT_SEARCH)||''%''
return l_sql;
end;
When a search value is entered, it returns the correct result set. All of the other pages are identical to this one in EVERY RESPECT except for differing underlying tables. But no matter what I've tried, I cannot get the SEARCH to return a result set on any of the pages except the first. It doesn't appear to do anything. I'm at my wit's end and totally disgusted. I have spent HOURS and HOURS on this. SOMEONE PLEASE GIVE ME A CLUE!!!!!

Answer 1

Page 1 and 2 look okay, page 3 has a clear cache process that runs when the page is submitted so that will clear the search item. Page 4 looks like it should work. Page 5 has an unconditional clear cache process, etc.
You probably don't want to clear the cache unless a reset button is used. The sequence of operations is: Report is shown on page. You enter a search value and press Enter or the Go button. The page is submitted. The page items are cleared by the clear cache process. The page branches back to itself only to show the results of the same query using a null search value. This could go on all day.
Scott