In MxO, Abilities in the main path of the tree (not tertiary abilities which dead-end on the side branches) need to be leveled up individually, so make sure to use the Upgrade Panel (L Key) every time you Level Up to increase the levels of the individual Abilities. This can also be done by clicking an arrow icon in the individual Ability description (Ability Tree at a Hardline or in the Loading Area.) I mention this because it sounded like you had a prerequisite of a prerequisite issue. Note also that the Upgrade Panel has a tab for Attributes. Don't forget to add points the points when you Level Up. There are some Abilities like Cryptography which don't do anything except provide a prerequisite for other Abilities, so don't ever level them beyond what's necessary to load their dependents. There are a few orphaned Abilities like Multi Fighting and Sharpshooter; don't waste your time, $info or Memory Capacity on them. Along with being able to change your Loadout on a whim, remember too that your Attributes can be reset to level 1 with a Stat Hack (acquire a Stat Hack Ticket at your organization's Archivist Broker, activate it and complete the mission to get your Stat Hack) so you're not locked in to your Stats and Class like in most MMOs. Aside from your names and gender, your Trait (which determines your base Attribute scores) is the only thing you can't change, so don't feel the need to make a separate RSI for specialization.
