I have a DIR 655 (FW 1.21) and DWA 142 with the latest drivers. When I run the combo in mixed g/n mode I have connection problems not just with the computer connected to the DWA 142 (an older HP Digital Entertainment Center 545 model, I believe) but also cannot maintain good connection with a new HP laptop that has built-in 802.11G. If I drop back to G mode, all is fine, except I can't stream movies very well out to the Entertainment Center from my network hard drive. I have strong signal, usually see connections at 300mbps, but then things go wonky, and I can't get a G or N connection. Again, drop back to G and all is well. Haven't tried it in pure N mode, but I need G compatibility for my other wireless products that are G only.
Any ideas?