I just tested in FTM 2012 and in the AMT online tree, using both the vintage merge/attach and the new/beta.
I confirm that the sex is NOT importing from the census into FTM, but is importing into the online tree in both attach processes.
I tested in that manner to try to determine if the error was caused by the change in merge process in FTM, which has been discussed in this thread: http://boards.ancestry.com/topics.software.famtreemaker/9886...
Snip attached of a small family group, illustrating the issue. William was manually entered in the test tree, as male. I then did a merge of the family from the 1900 census. I manually changed his sister Catherine's sex, after the merge. The remaining children living at the 1900 census show the "?" in the sex column, as imported from the census.
This appears to be a glitch created with the changes to the merge process and should be reported to Tech Support, IMO.
Edit: A 2nd test with the new merge process in an online tree duplicated the failure to import from the sex field.
I have submitted to Support.
I also saw several comments about the same problem on ancestry's Facebook page.