the spoof for Rebug only seems to enable online mode on normal mode. when you go to rebug mode you get that same errors like before unable to go online.
and when you install the spoofer in rebug mode it works.. but it kills Cobra Mode with web man if you switch to the Cobra mode you cannot start any hombrew without crashing the PS3. so you need to re-install the firmware again to fix it as you cannot open the toolbox..
hope a real fix for rebug comes out soon so i can use all my rebug features online
Edit: CCAPI seems to be the issue, even on normal mode with Cobra + WebMan there are issues signing in and some apps crash.
with you want to use CCAPI be sure to disable web man Normal & Cobra modes should work then. just don't go to Rebug mode (uninstall CCAPI 1st if you wish to use REBUG Mode with Cobra)
the issue is that PS3 has low Memory Cobra & WebMan eat a lot of ram + CCAPI ps3 would be struggling to open Apps if on rebug mode it just completely crashes them.