Your lease is actually a contract with the owner of record and not the management. They are merely representatives of the owner. Therefore your existing lease, as contract and encumbrance upon the property remains valid.

This would only change if the option to void contracts (like a bankruptcy or foreclosure) kicked in. It does not sound like you are there. Also, the deposit is held by the owner or his agent (again the mgmt company). The old manager does not get to keep it.

You are, however, justified in asking for written clarification of the new arrangement (including deposit disposition) prior to paying rent.

Note: If the owner has changed (like the old owner sold it) then the lease is still effective but you could probably get someone to draw up something new.