Entering a tuplet after a time signature changing leads to a fail and a corruption

Nightly, November 10 (b24f784) / Windows7

1. Open "My First Score"

2. Fill the first measure with four quarter notes

3. Always in note entry mode -> drag and drop the 3/4 TimeSignature

Result: the cursor jumps.

4. In Note Entry mode always (the quarter note value is already selected), try to create a tuplet (Ctrl + 3)

Result: fail (no triplet), and worst, corruption.

Final result: without triplet :(

Additionnal note:

If you made: Exit Note entry mode before drag and drop the 3/4 TimeSig, the last quarter note of the first measure remains highlighted, and so the risk of mistake is possible (the entering of a tuplet on this last note)