reply to hyphenated IPv6 itself is stable, I use it everyday, in fact 1/3rd of the traffic on my network a month is IPv6.
If you ISP has deployed it then they deem it stable on their network (they don't want the support calls if it wasn't).
If something doesn't work then maybe disable if no other way to fix it, then get on the Devs to get it fixed. -- ASUS M4A79T Deluxe | AMD Phenom II x3 720 BE AM3 w/4 Cores @ 3.41Ghz(OC) | 4Gb DDR3 Memory @ 1600mhz | Sapphire ATI HD4870 1GB 800mhz/1000mhz(OC) | 2x500GB HDD's Raid 0 | Windows 7 Ultimate x64 Build 7600 (RTM) | Windstream DSL 12m (14.9m Sync)/766k
Yes you're right. It seems that various systems/apps may have issues with dual stack implementation or such. But on the other hand someone has to test/fix. Thanks