I am using Notes as well and can reproduce it.
1. Exit Notes and X1.
2. Fire up Notes. Fire up X1. (X1 fonts normal)
3. From X1, double-click on Notes e-mail to open it. (Screen switches to Notes and opens the e-mail)
4. Go back to X1.... fonts collapsed.
5. Restart X1... fonts back to normal. Back to step 3 repro's it again.
Definitely started in 6.7.4.
1. Exit Notes and X1.
2. Fire up Notes. Fire up X1. (X1 fonts normal)
3. From X1, double-click on Notes e-mail to open it. (Screen switches to Notes and opens the e-mail)
4. Go back to X1.... fonts collapsed.
5. Restart X1... fonts back to normal. Back to step 3 repro's it again.
Definitely started in 6.7.4.