The error means you have fields on a tab that hides that tab. This effectively means a tab is hiding it self and it won't be able to reverse the condition as once the tab is hidden the fields that caused it to hide will also hide (as they're on the tab that's being hidden). It's informing you of this to ensure you don't lock a tab from being used.

The warning means you have a conditional with "Equal To" and the value is empty. You should use "Is Empty" or "Is Not Empty".

The info means you have step by step enabled, but aren't validating each step (so they could skip from step 1 to step 4 if they wanted without completing the previous). It's not an issue. It's just informing you of this fact.

As for the 5th condition not working was able to confirm this as a bug and have created the below bug ticket for further investigation.

forge.joomlapolis.com/issues/3638

any idea when this will be available?

Later this week; probably Friday.

If not in the next couple of days then can you PM me the file ahead of release or let me know what code needs to change to fix it now?

Quickfix is to simply edit getTabConditional and getFieldConditional in cbconditional.class.php then find "for ( $i = 1, $n = 5; $i < $n; $i++ ) {" and change it to "for ( $i = 1, $n = 5; $i <= $n; $i++ ) {".