diff --git a/sync/src/scraper.ts b/sync/src/scraper.ts
index 3c6515a..283fc0c 100644
--- a/sync/src/scraper.ts
+++ b/sync/src/scraper.ts
@@ -48,12 +48,11 @@ export async function scrapeAll(username: string, password: string): Promise<{
   try {
     await login(page, username, password);
 
-    // After login, page is on Start.aspx (frameset with top.topFrame etc.).
-    // The member list page runs alterBreadcrumbs() on load, which accesses top.topFrame.
-    // Navigating the whole page away from the frameset breaks that check → NoTabsAllowed redirect.
-    // Instead, navigate the mainFrame (inner frame) so the frameset context stays intact.
-    const mainFrame = page.frame({ name: 'mainFrame' });
-    if (!mainFrame) throw new Error('mainFrame not found in Start.aspx frameset');
+    // After login, page is on Start.aspx (frameset).
+    // Direct navigation to MitgliedschaftenList.aspx causes a server BLError because
+    // the server reads the org context from session variables set by the menu.
+    // Navigate via the menu frame (left.aspx) to set session state properly.
+    const mainFrame = await navigateToMemberList(page);
 
     const members = await scrapeMembers(mainFrame);
     log(`Found ${members.length} members`);
@@ -65,7 +64,6 @@ export async function scrapeAll(username: string, password: string): Promise<{
         const quals = await scrapeMemberAusbildung(mainFrame, member);
         ausbildungen.push(...quals);
         log(`  ${member.vorname} ${member.zuname}: ${quals.length} Ausbildungen`);
-        // polite delay between requests
         await page.waitForTimeout(500);
       } catch (err) {
         log(`  WARN: could not scrape Ausbildung for ${member.vorname} ${member.zuname}: ${err}`);
@@ -118,34 +116,52 @@ async function login(page: Page, username: string, password: string): Promise<vo
   log(`Logged in successfully, redirected to: ${currentUrl}`);
 }
 
-async function scrapeMembers(frame: Frame): Promise<FdiskMember[]> {
-  log(`Navigating to members list: ${MEMBERS_URL}`);
-  await frame.goto(MEMBERS_URL, { waitUntil: 'domcontentloaded' });
-  await frame.waitForLoadState('networkidle');
+async function navigateToMemberList(page: Page): Promise<Frame> {
+  const menuFrame = page.frame({ name: 'menu' });
+  if (!menuFrame) throw new Error('Menu frame (left.aspx) not found in Start.aspx frameset');
 
-  const frameUrl = frame.url();
-  const frameTitle = await frame.title();
-  log(`Members frame loaded: ${frameUrl} — title: "${frameTitle}"`);
+  await menuFrame.waitForLoadState('networkidle');
 
-  // The member list requires a POST (form submit) to show results.
-  // Navigate to the base page first (which loads VIEWSTATE etc.), then submit the search form.
-  const formExists = await frame.$('form[name="frmsearch"]') !== null;
-  log(`Search form found: ${formExists}`);
+  // Log all menu links for diagnostics
+  const menuLinks = await menuFrame.$$eval('a', (as) =>
+    as.map((a) => ({ text: (a.textContent ?? '').trim(), href: a.href })).filter((l) => l.href),
+  );
+  log(`Menu links (${menuLinks.length}): ${JSON.stringify(menuLinks.slice(0, 20))}`);
 
-  if (!formExists) {
-    const tableClasses = await frame.$$eval('table', (ts) =>
-      ts.map((t) => `${t.className || '(no-class)'}[${t.querySelectorAll('tr').length}rows]`),
-    );
-    log(`Tables in frame: ${tableClasses.join(', ') || 'none'}`);
-    throw new Error(`frmsearch form not found on ${frameUrl} — cannot load member list`);
+  // Find the Mitgliedschaften link and click it — this sets the server-side session
+  // context and navigates mainFrame to the correct URL
+  const mitgliedLink = menuFrame.locator('a[href*="MitgliedschaftenList"], a[href*="mitglied" i]').first();
+  const found = await mitgliedLink.count() > 0;
+  if (!found) {
+    throw new Error('Could not find Mitgliedschaften link in menu frame — check menu link log above');
   }
 
-  // Submit the form as-is (no filters) to get all members
-  await frame.evaluate(() => {
-    (document as any).forms['frmsearch'].submit();
-  });
-  await frame.waitForLoadState('networkidle');
-  log(`After form submit: ${frame.url()}`);
+  const linkHref = await mitgliedLink.getAttribute('href');
+  log(`Clicking menu link: ${linkHref}`);
+  await mitgliedLink.click();
+
+  // Wait for mainFrame to load the member list
+  await page.waitForLoadState('networkidle');
+
+  const mainFrame = page.frame({ name: 'mainFrame' });
+  if (!mainFrame) throw new Error('mainFrame not found after menu navigation');
+
+  log(`mainFrame after menu click: ${mainFrame.url()}`);
+  return mainFrame;
+}
+
+async function scrapeMembers(frame: Frame): Promise<FdiskMember[]> {
+  log(`Scraping member list from: ${frame.url()}`);
+
+  // If the page landed on a search form (not results yet), submit it
+  const hasForm = await frame.$('form[name="frmsearch"]') !== null;
+  const hasTable = await frame.$('table.FdcLayList') !== null;
+  if (hasForm && !hasTable) {
+    log('Search form found without results — submitting...');
+    await frame.evaluate(() => { (document as any).forms['frmsearch'].submit(); });
+    await frame.waitForLoadState('networkidle');
+    log(`After form submit: ${frame.url()}`);
+  }
 
   // The member table uses class FdcLayList
   await frame.waitForSelector('table.FdcLayList', { timeout: 20000 });