diff --git a/static/panes/compiler.ts b/static/panes/compiler.ts
index 6ed08a8f1..00d15bdb1 100644
--- a/static/panes/compiler.ts
+++ b/static/panes/compiler.ts
@@ -363,7 +363,7 @@ export class Compiler extends MonacoPane<monaco.editor.IStandaloneCodeEditor, Co
             this.compiler?.id ?? '',
             this.onCompilerChange.bind(this),
         );
-        this.initLibraries(state);
+        await this.initLibraries(state);
         this.sendCompiler();
         this.updateCompilerInfo();
         this.updateButtons();
@@ -2646,6 +2646,8 @@ export class Compiler extends MonacoPane<monaco.editor.IStandaloneCodeEditor, Co
                 this.compiler?.remote,
             ),
         );
+        // Wait for the lazily-loaded libraries to be selected before compiling or persisting state.
+        await this.libsWidget.stateLoaded;
     }
 
     async updateLibraries(): Promise<void> {
diff --git a/static/panes/executor.ts b/static/panes/executor.ts
index 9208f0152..fdc8d969a 100644
--- a/static/panes/executor.ts
+++ b/static/panes/executor.ts
@@ -186,7 +186,7 @@ export class Executor extends Pane<ExecutorState> {
             this.compilerIsVisible,
         );
 
-        this.initLibraries(state);
+        await this.initLibraries(state);
         this.updateCompilerInfo();
         this.updateState();
 
@@ -906,6 +906,8 @@ export class Executor extends Pane<ExecutorState> {
                 this.compiler?.remote ?? undefined,
             ),
         );
+        // Wait for the lazily-loaded libraries to be selected before compiling or persisting state.
+        await this.libsWidget.stateLoaded;
     }
 
     onFontScale(): void {
diff --git a/static/widgets/libs-widget.ts b/static/widgets/libs-widget.ts
index dcbbb4ebe..4ac24aac8 100644
--- a/static/widgets/libs-widget.ts
+++ b/static/widgets/libs-widget.ts
@@ -139,6 +139,9 @@ export class LibsWidget {
 
     private readonly onChangeCallback: () => void;
 
+    // Resolves once the saved state has been applied to the lazily-loaded library list.
+    public readonly stateLoaded: Promise<void>;
+
     private readonly availableLibs: AvailableLibs;
     private readonly filters: PopupAlertFilter[] = [
         (compilerId, langId) => {
@@ -176,9 +179,10 @@ export class LibsWidget {
         this.initButtons();
         this.onChangeCallback = onChangeCallback;
         this.availableLibs = {};
-        this.updateAvailableLibs(possibleLibs, true).then(() => {
+        this.stateLoaded = this.updateAvailableLibs(possibleLibs, true).then(() => {
             this.loadState(state);
             this.fullRefresh();
+            this.updateButton();
         });
 
         const searchInput = this.domRoot.find('.lib-search-input');