I agree that this is an annoyance.
If I remember correctly, whenever it happened to me, I deleted the "to Coda" in the part, removed and recreated the 8 measures rest and recreated the "To Coda". In each part, not funny...
I haven't seen the problem in Finale 2010 yet, but I wouldn't bet it is not there.
Finale 2012c, 2011c, 2010b, 2009b. MacOsX 10.8.5, Mac Mini Intel Core i7 2,7 Ghz, 16 Go Ram, Dolet 6. Azerty kb. Full TGTools. MOTU Midi Express XT USB, Roland Sound Canvas SC-88vl, MOTU Audio Express.