Greetings,
To reproduce the problem:
1) Create a new document
2) Use spell check
3) Click on "Save" or "Save As"
4) Entire Feng Office becomes unresponsive and must be closed down and restarted
An acceptable work around for this problem would be if Feng Office spell check could be disabled. The native Firefox right click spell check is (IMO) far superior and is what our office is used to using in any case.