[JKT]

First, what version of OmniWeb are you actually using? If it is 5.1.3 or earlier, then you will experience problems. If it is the 5.5 sneakypeek, then you may still experience problems, but they will be no worse than those of Safari. However, there is one issue that OmniWeb will suffer from that Safari will not. The sites may be browser sniffing and if they are only expecting to find an earlier version of OmniWeb they may not serve it a page with full functionality (e.g. google maps etc). Try identifying as either Safari or FireFox at those two sites and see if that solves the problem. If it doesn't, does Safari also exhibit the same issues? If it does, then this is a problem with WebKit that Apple needs to solve before OmniGroup can do anything about it.