diff --git a/src/main/backup.ts b/src/main/backup.ts
index 7e74bc6..ba9c651 100644
--- a/src/main/backup.ts
+++ b/src/main/backup.ts
@@ -48,7 +48,18 @@ export function ensureRecoveryBackup(bookPath: string): string | null {
   const dest = path.join(getRecoveryRoot(), `${bookName}-${stamp}`);
 
   fs.mkdirSync(getRecoveryRoot(), { recursive: true });
-  fs.cpSync(key, dest, { recursive: true });
+  try {
+    fs.cpSync(key, dest, { recursive: true });
+  } catch (err) {
+    // A half-copied directory is worse than none — it looks like a good
+    // backup. Remove the partial copy, then surface the failure.
+    try {
+      fs.rmSync(dest, { recursive: true, force: true });
+    } catch {
+      // best-effort cleanup only
+    }
+    throw err;
+  }
 
   sessionBackedUp.add(key);
   return dest;
diff --git a/src/main/migration.ts b/src/main/migration.ts
index 61c2245..67b80aa 100644
--- a/src/main/migration.ts
+++ b/src/main/migration.ts
@@ -107,7 +107,19 @@ export function migrateChapterToNative(
     entry.file = newFile;
     meta.docFormat = "folio-doc";
     meta.docSchemaVersion = CURRENT_DOC_SCHEMA_VERSION;
-    saveMeta(bookPath, meta);
+    try {
+      saveMeta(bookPath, meta);
+    } catch (err) {
+      // Meta write failed: roll the orphan chapter JSON back so the book
+      // stays consistent with folio.json (still pointing at the .md). A
+      // later retry simply rewrites it.
+      try {
+        fs.rmSync(path.join(bookPath, newFile), { force: true });
+      } catch {
+        // best-effort cleanup only
+      }
+      throw err;
+    }
 
     return { status: "migrated", id, file: newFile };
   } catch (err) {
diff --git a/src/renderer/dialog.ts b/src/renderer/dialog.ts
index f3cb155..4b812cd 100644
--- a/src/renderer/dialog.ts
+++ b/src/renderer/dialog.ts
@@ -17,6 +17,10 @@ let currentMode: Mode = "prompt";
 let resolver: ((value: string | null) => void) | null = null;
 
 function open(mode: Mode, title: string, body: string, value: string): Promise<string | null> {
+  // If a previous dialog was somehow still open (menu accelerators can open
+  // one while another is visible), settle its promise as cancelled so the
+  // awaiting caller isn't stranded forever.
+  close(null);
   currentMode = mode;
   titleEl.textContent = title;
   msgEl.textContent = body;
diff --git a/src/renderer/print-format.ts b/src/renderer/print-format.ts
index 185df45..1b3ad2b 100644
--- a/src/renderer/print-format.ts
+++ b/src/renderer/print-format.ts
@@ -139,7 +139,18 @@ function tableToHtml(node: FolioNode): string {
       const cells = (row.content ?? [])
         .map((cell) => {
           const tag = cell.type === "tableHeader" ? "th" : "td";
-          return `<${tag}>${inlineToHtml((cell.content?.[0]?.content ?? []) as FolioNode[])}</${tag}>`;
+          const blocks = cell.content ?? [];
+          // A cell can hold multiple blocks (Tiptap allows multi-paragraph
+          // cells); render them all instead of silently dropping every block
+          // after the first. The common single-paragraph cell keeps its old
+          // bare-inline shape so existing table styling is untouched.
+          let inner: string;
+          if (blocks.length === 1 && blocks[0].type === "paragraph") {
+            inner = inlineToHtml(blocks[0].content);
+          } else {
+            inner = blocks.map(blockToHtml).join("");
+          }
+          return `<${tag}>${inner}</${tag}>`;
         })
         .join("");
       return `<tr>${cells}</tr>`;
diff --git a/src/renderer/theme.ts b/src/renderer/theme.ts
index d1162e6..60bdf23 100644
--- a/src/renderer/theme.ts
+++ b/src/renderer/theme.ts
@@ -14,9 +14,14 @@ export function selector(): HTMLSelectElement {
 // theme, which replaced it as Folio's default light appearance.
 const LIGHT = "light";
 
+// Themes with a real entry in themes.css + the selector. Anything else that
+// might linger in saved settings (a removed theme, a typo) falls back to
+// Light so the <select> never desyncs from its <option> list.
+const KNOWN = new Set(["light", "dark-mode", "neon", "meridian"]);
+
 function normalizeTheme(id: unknown): string {
   if (typeof id !== "string" || !id || id === "default") return LIGHT;
-  return id;
+  return KNOWN.has(id) ? id : LIGHT;
 }
 
 export function applyTheme(id: string): void {