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I had this problem right when I levelled up I got disconnected. When I reconnected to the game the UI indicated I had a point still left to invest into one of my skills, but there were no +1 tabs available for me to click on. I continued anyways thinking maybe on the next level up I'll get the tab. Nothing happened and I had about 4 or so points available when all of a sudden they just invested themselves into different skills and eventually I got a +1 tab on my next level up. Not sure if this has been reported before, I tried making a search for it but I might not have searched hard enough ^^;;;