actually that's nothing to do with v6.4.5 I don't think.

I was running 6.4.5 on a couple of 64bit AMD's under CentOS just fine, though they now are running 6.5 (and have issues due to scheduling and GPUGrid making it think it needs more cpu resource ) The boinc developers are working on this for the 6.6 series coming out probably in the next few weeks..

Waiting to report just means that it hasn't ran a scheduled report to the server in a while. This could be due to many reasons, but mainly it's the value of the 'connected to internet every X days' which should be set to 0 for always on, and yes this can be overrode at the client-side but it's not really necessary...

After all that though, if you can I'd stick with 6.2.19 or 6.2.21 anyway due to the scheduling problems which have cropped up recently.

Bok