If an Alt-combination does not work, try the Command-Alt-combination or through the menu.
For instance:
- Alt-Tab: works
- Alt-F: fails
- Command-Alt-F: works (starts the file menu
- Alt-Space: fails
- Command-Alt-Space: fails
- Via the menu: works
–jeroen
via: Making Keystrokes with Macintosh Keyboards – Citrix eDocs.