Hi Tim,
Thanks for reporting this issue.
There is also another work around if your singers are familiar with "swing" notation. I play in a big band, and we have a lot of pieces that are written in "swing" notation. This just means that pairs 8th notes which look "straight" are understood implicitly to be "swung" in the same timing fashion as the tuplets that you have notated. Not all musicians understand this, though, so your mileage may vary. You can also go another step to get back to the "standard" notation WITH the ties - please see below
If you use Format/Retranscribe, and then select "swing" as the Rhythm style, you will get what looks like "straight" notation, but the musician can "swing" it. In the following screen shot, I've used the Format/Retranscribe on the Tenor staff but not the Bass:
SwingTenor.jpg
As you can see, I was able to tie the 8th note from the end of measure 9 to the quarter note at the beginning of measure 10.
Now, if you don't want to leave it in "Swing" notation, but want the tuplets back, just use Format/Retranscribe again (after tying the notes you want) and then select "Standard" (which is the default). Now the tuplets are there AND so are the ties.
I've entered this issue into our database for bug fixing, but hopefully the above workaround (or yours) will get you by for now.
Thanks again for reporting the issue!
ttfn,
Sherry