If you open a new sequence and select a musical song without clicking on anything else the timing import options are greyed out. If you open a new sequence, then click the button for musical sequence and then select a song you will be allowed to import timing info. I believe it should work the same way by either selecting the song first or by clicking the button first.
That used to happen to me (the Import choices would be greyed out if I didn't pre-select) but it is not doing it now in Version 3.2.6. Perhaps they slipstreamed in a fix.
If you open a new sequence and select a musical song without clicking on anything else the timing import options are greyed out. If you open a new sequence, then click the button for musical sequence and then select a song you will be allowed to import timing info. I believe it should work the same way by either selecting the song first or by clicking the button first.