Randy wrote:
Hi,
I noticed there are SOME aluminum wires in the new home, specifically
the very thick rough-in cable (red, black, white and bare ground in
the cable) from outside to the main service panel, and the thick 240V
cable from the service panel to range outlet (same red, black, white
and bare ground in the cable) appear to be aluminum. All other branch
circuits are copper. Does this wiring comply with NEC code?

Yes (assuming it's done right)

Are they more likely to cause trouble than copper...

No.

Is it normal practice to put in these aluminum cables for entrance
and range in new constructions nowadays?

It probably is. Find something else to worry about ;-)

Bob