Greetings. I am new and seem to be having the same problem. I do not have the Calendar app installed, but I have noticed that when I go into reading mode, I can do CTRL+A and select all the text, but as soon as I initiate the CTRL+C command, it deselects all the text and nothing is copied. Here’s my debug info if that helps:
SYSTEM INFO:
Obsidian version: v1.5.3
Installer version: v1.4.16
Operating system: Windows 10 Pro 10.0.19045
Login status: logged in
Catalyst license: none
Insider build toggle: off
Live preview: on
Base theme: adapt to system
Community theme: LYT Mode v1.9.1
Snippets enabled: 0
Restricted mode: off
Plugins installed: 13
Plugins enabled: 11
1: Google Keep Import v1.1.3
2: Importer v1.5.6
3: Zotero Integration v3.1.7
4: Tag Wrangler v0.6.1
5: Core Search Assistant v0.9.2
6: Quick Explorer v0.2.8
7: File Explorer Note Count v1.2.1
8: Kindle Highlights v1.9.2
9: Filename Heading Sync v1.9.0
10: Omnisearch v1.21.1
11: Extract Highlights v0.0.18