You did not get the point. Does the preset say 'check' when you check with any other piece than an Advancer? I think it doesn't. So then this has nothing to do with the piece being an Advancer.
I dug back into this thread to find the preset he was talking about. He linked to a particular game in which neither Advancer checked the opponent's King. Continuing this game by choosing Annotate and then Move, I played some moves to get a White Flying Dragon to check the Black King, and when I did, it said "check!". After moving the King out of check, I tried to move White's Advancer, but no legal moves are being highlighted on the board for it. However, its legal moves do show up in the Moves field, and when I tried one, it worked. At the top of the Moves field, I see the legal move "A e1-#to; A #to-b1". I think this is not a properly formatted move, and it may be interfering with the ability to recognize the Advancer's legal moves. Also, when I entered it, it did not recognize it as legal, and it gave the error message "#to is not a valid square".
Here are the moves to the position in question so that you can see what's going on.
1. P f2-f5
1... p f9-f6
2. P e2-e4
2... p e9-e7
3. F i1-h3
3... f i10-h8
4. P i2-i3
4... p d9-d8
5. B h1-i2
5... c g10-f7
6. C d1-f3
6... f b10-c8
7. C g1-e3
7... c d10-f8
8. K f1-i1
8... p g9-g7
9. P b2-b3
9... c f8-e5
10. P d2-d4
10... c e5-f8
11. B c1-b2
11... a e10-h7
12. F b1-e2
12... p i9-i8
13. P g2-g5
13... c f7-e8
14. P g5-g6
14... a h7-f9
15. P c2-c4
15... p b9-b6
16. F h3-g2
16... c e8-d7
17. P d4-d5
17... f c8-d6
18. F e2-h3
18... p c9-c7
19. C f3-e6
19... c d7-e6
20. P d5-e6
20... p j9-j8
21. B b2-a3
21... b c10-a8
22. B a3-d6
22... p e7-d6
23. R h1-f1
23... p j8-j7
24. F g2-d3
24... b h10-j8
25. C e3-g1
25... f h8-i6
26. P j2-j3
26... p d8-d7
27. P a2-a5
27... p b6-a5
28. R a1-a5
28... b a8-b9
29. P e6-d7
29... f9-e8;@-d7
30. C g1-a7
30... f i6-h4
31. C a7-d8 // - check! -
31... k f10-f9
Just click on Annotate for Butterfly Chess and paste these in to see the same position.
I dug back into this thread to find the preset he was talking about. He linked to a particular game in which neither Advancer checked the opponent's King. Continuing this game by choosing Annotate and then Move, I played some moves to get a White Flying Dragon to check the Black King, and when I did, it said "check!". After moving the King out of check, I tried to move White's Advancer, but no legal moves are being highlighted on the board for it. However, its legal moves do show up in the Moves field, and when I tried one, it worked. At the top of the Moves field, I see the legal move "A e1-#to; A #to-b1". I think this is not a properly formatted move, and it may be interfering with the ability to recognize the Advancer's legal moves. Also, when I entered it, it did not recognize it as legal, and it gave the error message "#to is not a valid square".
Here are the moves to the position in question so that you can see what's going on.
Just click on Annotate for Butterfly Chess and paste these in to see the same position.