Hi all,
have been experiencing this problem since the 2008 version. Seems like it still exists in 2016.
After I have typed the greek capital S (Σ), it does appear correct in the text box but after you confirm, it appears as (tm).
This does not happen however with the lower case fonts which appear just fine. Have tried Arial, Arial Unicode, Times New Roman and a few others.
This issue has been discussed again in this thread:
Thanks in advance for any replies.