diff --git a/packages/ui/src/stores/useDirectoryStore.ts b/packages/ui/src/stores/useDirectoryStore.ts
index 77ab79b8..372cc6a0 100644
--- a/packages/ui/src/stores/useDirectoryStore.ts
+++ b/packages/ui/src/stores/useDirectoryStore.ts
@@ -45,7 +45,9 @@ const normalizeDirectoryPath = (value: string): string => {
   if (!trimmed) {
     return trimmed;
   }
-  const normalized = trimmed.replace(/\\/g, '/');
+  const normalized = trimmed
+    .replace(/\\/g, '/')
+    .replace(/^([a-z]):/, (_, letter: string) => letter.toUpperCase() + ':');
   if (normalized.length > 1) {
     return normalized.replace(/\/+$/, '');
   }
diff --git a/packages/ui/src/sync/sync-context.tsx b/packages/ui/src/sync/sync-context.tsx
index afeb34c8..8bf50c4f 100644
--- a/packages/ui/src/sync/sync-context.tsx
+++ b/packages/ui/src/sync/sync-context.tsx
@@ -108,10 +108,16 @@ function isRecentBoot() {
 }
 
 function handleEvent(
-  directory: string,
+  rawDirectory: string,
   payload: Event,
   childStores: ChildStoreManager,
 ) {
+  // Normalize directory path: SSE events from OpenCode use native OS separators
+  // (backslashes on Windows) and may differ in drive-letter case.
+  // Child stores are keyed with forward slashes and uppercase drive letters.
+  const directory = rawDirectory && rawDirectory !== "global"
+    ? rawDirectory.replace(/\\/g, "/").replace(/^([a-z]):/, (_, l: string) => l.toUpperCase() + ":")
+    : rawDirectory
   // Global events
   if (directory === "global" || !directory) {
     const recent = isRecentBoot()