A new patch has been released for The Sims 2 Seasons is available for download, the patch lifts the game to version 1.7.0.151 and is for the disk version only, a separate patch is available for the downloaded version.

Custom objects will now be preserved when uploading Lots to the Exchange.
Musician Career Track career reward (Rock Hammer) now has audio functioning correctly.
Sim Babies no longer cry excessively.

Instructions: Save the file to disk and then run it to install the patch.
Please make sure you have your game CD's available during patch installation.

Notes on Patching your game.
You only need to apply the most recent patch for the most recent EP you have installed.
This is because the installation of your most recent EP includes all previous bug fixes, so there is no need to apply previous patches