where have all the tuplets gone?

Hi,

Musescore 0962 (bug also present in 0963)
Windows xp pro

I enclose 2 files. "move guitar " "1 and 2".

Open move guitar-1.
Choose create-instruments
Choose guitar and move it down so that it is placed between tenorsax and trombone.
Save the file as move guitar-2.

Close.

Start again and open "move guitar-2"
All systems ABOVE guitar have lost their tuplets. Guitar and all systems below are OK.

Not so good...

regards
ph