I am from india and have a unrooted ace . I just updated my firmware from DDKQ5 to DDKQ6 via kies. After that the market search for some apps do not show them in search list ; no matter how you try to search it, while accessing similar apps from pc, it shows that my device is not compatible with the app ; though it worked,got updated just fine before update.
I also had similar problem while my phone was having 2.2.1 on it, after a few days of using the phone after purchase. But after 2.3.4 DDKQ5 update ; problem resolved automatically.
PLZ help