diff --git a/README.md b/README.md
index 9b7a521..1dc3402 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,7 @@ The connection is through a YAML frontmatter key.
 
 1. A Trello account
 2. The [MetaEdit](https://github.com/chhoumann/MetaEdit) Obsidian plugin (install from inside Obsidian)
+   - Obsidian Trello makes use of MetaEdit's [YAML Frontmatter API](https://github.com/chhoumann/MetaEdit#api).
 3. A Trello API token (see below).
 
 Before you can connect a Trello card, you need to create an API token and set it in the plugin settings. You can create a token [here][tokenurl]; make sure to copy it before closing the tab.
diff --git a/src/plugin.ts b/src/plugin.ts
index 965b027..f60b274 100644
--- a/src/plugin.ts
+++ b/src/plugin.ts
@@ -40,7 +40,8 @@ export class TrelloPlugin extends Plugin {
   async onload(): Promise<void> {
     // Set up data and default data.
     const savedData: PluginData | undefined = await this.loadData();
-    this.state = new PluginState(this, savedData || DEFAULT_DATA);
+    const data: PluginData = Object.assign({}, DEFAULT_DATA, savedData);
+    this.state = new PluginState(this, data);
 
     // Create new API instance
     this.api = new TrelloAPI(this);
@@ -65,8 +66,8 @@ export class TrelloPlugin extends Plugin {
     // Register trello view type
     this.registerView(TRELLO_VIEW_TYPE, (leaf: WorkspaceLeaf) => (this.view = new TrelloView(this, leaf)));
 
-    // Register file handler to check if the opened card is trello connected
-    this.app.workspace.on('file-open', async (file) => this.handleFile(file));
+    // Register file handler to check if the opened card is trello connected\
+    this.registerEvent(this.app.workspace.on('file-open', async (file) => this.handleFile(file)));
     // Also check the current file on load
     this.handleFile(this.app.workspace.getActiveFile());
 
diff --git a/src/settings/board-select-modal.ts b/src/settings/board-select-modal.ts
index 0e12343..9bd82a4 100644
--- a/src/settings/board-select-modal.ts
+++ b/src/settings/board-select-modal.ts
@@ -86,14 +86,14 @@ export class BoardSelectModal extends Modal {
     container.createDiv({ text: board.name, cls: 'trello-board-select--toggle-label' });
     const toggle = container.createDiv({ cls: 'trello-board-select--toggle checkbox-container' });
     if (this.newState[board.id]) {
-      toggle.classList.add('is-enabled');
+      toggle.addClass('is-enabled');
     }
     container.addEventListener('click', () => {
       if (this.newState[board.id]) {
-        toggle.classList.remove('is-enabled');
+        toggle.removeClass('is-enabled');
         delete this.newState[board.id];
       } else {
-        toggle.classList.add('is-enabled');
+        toggle.addClass('is-enabled');
         this.newState[board.id] = board;
       }
     });