Can't install an update.zip in SPRecovery

I'm not able to install either Titanium Backup from an update.zip or the new market app that Armyof2 posted in another thread.

I've never been able to install TB that way, either as a system or user app, and TB and the market app both fail with Installing update... and then Installation aborted.

I've never had a problem installing Sapphire over several releases and I've installed several kernels and a theme or two in this manner without any problems.

Any ideas on what's wrong? Are there log files that I can view for the failed installs? I'm running Sapphire 2.0 but never got TB installed when I was running 1.10.

Thanks,
Jim