Note: I was reminded of this by: http://alpha.glitch.com/forum/bugs/2561/
Repro Steps
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Select a skill to learn (A)
Stay on the skills page while the skills finishes
Look at the tooltip of a skill (B) that has A as a pre-req
Expected Behavior
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It says you can learn the skill
Actual Behavior
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It says you cannot until you reload
(You can, however, learn it by clicking on the skill's icon)