I selected RSRD Sources manually (Basics, Monsters, Psionics) and I created a level 6 Human Monk with all the requisites for the Psionic Fist class: I picked Wild Talent at level 1 and added 9 Concentration ranks. The level 6 Monks have a Base Attack Bonus of +4 and it gets the Still Mind feat at level 3.
When I select the Psionic Fist class from the tab Class, it's red colored because, it says, I don't have Still Mind.
I checked the .LST files but it looks all fine to me.
I also tried the 6.07 version of the program but the bug is there too.
Windows 10 (64 bit) - Java 8